What are fixed and variable costs in the context of Edexcel IGCSE Business Studies?

In Edexcel IGCSE Business Studies, fixed costs are expenses that do not change with the level of output, such as rent and salaries. Variable costs, on the other hand, fluctuate with production levels, including costs like raw materials and direct labor. Understanding these costs is crucial for calculating total costs and analyzing business profitability.

How is break-even analysis used in business decision-making?

Break-even analysis is a tool used to determine the point at which a business's total revenues equal its total costs, resulting in neither profit nor loss. This analysis helps businesses understand the minimum sales volume needed to avoid losses and is essential for pricing strategies, budgeting, and financial planning.

Why is break-even analysis important for Edexcel IGCSE students studying Business activity and influences on business?

Break-even analysis is important for Edexcel IGCSE students because it provides insight into the financial viability of a business. It helps students understand how costs, sales, and profits interact, which is crucial for making informed business decisions and understanding the influences on business activities.

What is the formula for calculating the break-even point in units?

The formula for calculating the break-even point in units is: Break-even point (units) = Fixed Costs / (Selling Price per Unit - Variable Cost per Unit). This formula helps determine the number of units that must be sold to cover all costs, which is a fundamental concept in business studies.

How do changes in costs and prices affect the break-even point?

Changes in costs and prices can significantly impact the break-even point. An increase in fixed or variable costs will raise the break-even point, requiring more sales to cover costs. Conversely, an increase in the selling price per unit will lower the break-even point, allowing a business to reach profitability with fewer sales. Understanding these dynamics is crucial for effective business management.

Why is "Confusing fixed and variable costs" a common mistake in Costs and break-even Analysis?

Why it happens: Some costs (semi-variable) blur the line; some students don't think systematically. How to avoid it: Test: 'if output stopped tomorrow, would this cost stop?' YES = variable; NO = fixed. Rent (NO → fixed); raw materials (YES → variable). Source: 4BS1 Examiner Reports 2022-2024

Why is "Writing only the final answer without showing the working" a common mistake in Costs and break-even Analysis?

Why it happens: Students focus on getting to the answer. How to avoid it: Always show: formula → calculation → answer with units. Each step earns a mark; even a wrong final answer gets process marks for correct working.

Why is "Calculating contribution per unit by SUBTRACTING price from variable cost (wrong direction)" a common mistake in Costs and break-even Analysis?

Why it happens: Students confuse which order subtraction goes. How to avoid it: **Contribution = SELLING PRICE − VARIABLE COST PER UNIT**. Always price minus cost (price is bigger). Negative contribution means selling below variable cost — not a real situation in normal trading.

Why is "Giving numerical answers without units (loaves, dresses, £)" a common mistake in Costs and break-even Analysis?

Why it happens: Students treat it as a pure maths exercise. How to avoid it: Always label answers with units: '1,000 loaves per month' not '1,000'. '£5,000 revenue' not '5,000'. The label confirms understanding.

Why is "Computing break-even using only fixed cost or only variable cost" a common mistake in Costs and break-even Analysis?

Why it happens: Students forget to take contribution per unit (which requires BOTH). How to avoid it: Break-even formula needs contribution per unit (selling price − variable cost). Make sure both pieces of information are used. Check: contribution should always be positive.

Business activity and influences on businessPearson Edexcel IGCSE Business Studies 4BS1

Costs and break-even Analysis

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Costs and Break-even Analysis — Pearson Edexcel International GCSE Business Studies 4BS1 Study Notes (2026 onwards)

Fixed costs, variable costs, total costs, revenue, profit, contribution and the break-even point. Includes the break-even formula, margin of safety calculation and how to read break-even charts. A core numerical topic in 4BS1.

What you’ll learn

Mapped to the Pearson Edexcel IGCSE 4BS1 syllabus (2026 onwards).

Distinguish between fixed, variable and total costs.
Calculate revenue, profit and contribution per unit.
Calculate the break-even point in units using the formula: Fixed costs ÷ Contribution per unit.
Calculate the margin of safety and explain its importance.
Read and interpret a break-even chart.
Apply break-even analysis to a case-study business and evaluate its usefulness.

Fixed costs, variable costs and total costs

Fixed costs stay the same; variable costs change with output. Together they make total costs.

Fixed costs

Costs that do NOT change with the level of output (in the short term).
Examples: rent, manager salaries, insurance, business rates, depreciation, loan interest.
Properties: the firm pays these even if it produces zero output.
Graphically: a horizontal straight line on a cost-output graph.

Variable costs

Costs that change directly with the level of output.
Examples: raw materials, packaging, piece-rate wages, sales commission, fuel for delivery vans.
Properties: zero variable cost if zero output; doubles if output doubles.
Graphically: an upward-sloping straight line on a cost-output graph.

Total costs

Total costs = Fixed costs + Variable costs.
Both depend on output: fixed costs are constant; variable costs rise.
Graphically: a straight line starting at the fixed-cost level and sloping upwards.

Semi-variable costs (A* extension)

Some costs have both fixed and variable elements. Example: a phone contract with a £30/month rental (fixed) + per-call charge (variable). For 4BS1, treat as semi-variable and split into the two parts.

Worked example

A bakery has fixed costs of £3,000/month (rent + salaries) and £2 variable cost per loaf (flour, yeast, packaging).

Output (loaves/month)	Fixed costs	Variable costs	Total costs
0	3,000	0	3,000
500	3,000	1,000	4,000
1,000	3,000	2,000	5,000
2,000	3,000	4,000	7,000
3,000	3,000	6,000	9,000

Edexcel application tip. Many candidates confuse fixed and variable. A useful test: 'if the firm stopped producing tomorrow, would this cost stop?' If YES (raw materials), it's variable. If NO (rent, insurance, manager salaries), it's fixed.

Fixed costs don't change with output — rent, salaries, insurance, depreciation.
Variable costs change with output — materials, piece-rate wages, packaging.
Total costs = fixed + variable.
Test: would the cost stop if output stopped? YES = variable; NO = fixed.

See the full worked example for costs and break-even analysis →

Revenue, profit and contribution

Revenue = price × quantity. Profit = revenue − total costs. Contribution = revenue − variable costs.

Revenue

Revenue = Selling price × Quantity sold.
Also called 'sales' or 'turnover' (though strict definitions vary).
Worked example: a bakery sells 2,000 loaves at £5 each → revenue = £10,000.

Profit

Profit = Revenue − Total costs.
The bottom line of trading.
Worked example: bakery with £10,000 revenue and £7,000 total costs → profit = £3,000.

Loss

Loss = Total costs − Revenue (when costs exceed revenue).

Contribution per unit

Contribution per unit = Selling price − Variable cost per unit.
The amount each unit sold contributes to paying off fixed costs (and then profit).
Worked example: bakery sells loaves at £5; variable cost per loaf is £2. Contribution per unit = £3.

Total contribution

Total contribution = Contribution per unit × Quantity sold.
Once total contribution covers all fixed costs, every further unit adds to profit.

Why contribution matters

Contribution is the bridge from individual product profitability to firm-level profitability. The first units sold each month contribute to paying off fixed costs. Once fixed costs are covered (break-even), every further unit's contribution is pure profit.

Edexcel pitfall. Don't confuse contribution (per unit profit before fixed costs) with profit (per unit after fixed costs are paid). Examiners frequently set up questions where candidates mis-use these terms.

Revenue = price × quantity sold.
Profit = revenue − total costs.
Contribution per unit = selling price − variable cost per unit.
Total contribution = contribution per unit × quantity.
Contribution shows what each unit adds to covering fixed costs and then profit.

See the full worked example for costs and break-even analysis →

The break-even point and its formula

Break-even = output where total revenue = total costs. Formula: Fixed costs ÷ Contribution per unit.

Break-even point

The break-even point is the level of output where Total Revenue = Total Costs — the firm makes neither profit nor loss. Below break-even, the firm loses money. Above break-even, every additional unit makes profit (the contribution).

The break-even formula

$\text{Break-even point (units)} = \frac{\text{Fixed costs}}{\text{Contribution per unit}}$

Why this formula works

Each unit sold contributes $\text{(Selling price - Variable cost per unit)}$ to paying off fixed costs.

When the firm has sold enough units that their total contribution equals total fixed costs, fixed costs are fully covered → break-even.

Worked example 1

A bakery has:

Fixed costs: £3,000/month.
Selling price: £5/loaf.
Variable cost: £2/loaf.

Step 1: Contribution per unit = £5 − £2 = £3.

Step 2: Break-even (units) = £3,000 ÷ £3 = 1,000 loaves per month.

Step 3: Verify. At 1,000 loaves:

Revenue = 1,000 × £5 = £5,000.
Variable cost = 1,000 × £2 = £2,000.
Fixed cost = £3,000.
Total cost = £2,000 + £3,000 = £5,000. Revenue = Total cost → break-even confirmed.

Worked example 2

A clothing brand has:

Fixed costs: £25,000/month.
Selling price: £40/shirt.
Variable cost: £15/shirt.

Step 1: Contribution per unit = £40 − £15 = £25.

Step 2: Break-even = £25,000 ÷ £25 = 1,000 shirts per month.

Calculating break-even revenue

If you need break-even in £ (not units): $\text{Break-even revenue} = \text{Break-even units} \times \text{Selling price}$

Bakery example: 1,000 loaves × £5 = £5,000 revenue at break-even.

Edexcel mark scheme expectations

Show every step of working — even if the final answer is wrong, process marks add up.
Use the formula explicitly: 'Break-even = Fixed costs / Contribution per unit'.
Label units (loaves, shirts) — not just numbers.
Round sensibly (don't sell 333.7 loaves — round to 334).

Break-even point = total revenue = total costs (no profit, no loss).
Formula: Fixed costs ÷ Contribution per unit.
Contribution per unit = Selling price − Variable cost per unit.
Break-even revenue = Break-even units × Selling price.
Always show working: contribution per unit calculation + formula + answer.

See the full worked example for costs and break-even analysis →

Margin of safety

The gap between actual sales and break-even sales — how big a fall in sales the firm could absorb before losing money.

Margin of safety

The margin of safety is the difference between current sales and break-even sales:

$\text{Margin of safety (units)} = \text{Current sales (units)} - \text{Break-even sales (units)}$

It tells the firm how many units sales could fall before the firm starts losing money.

Worked example

Bakery break-even = 1,000 loaves/month. Currently selling 1,500 loaves/month. Margin of safety = 1,500 − 1,000 = 500 loaves.

This means sales could fall by 500 loaves (33%) before the bakery hits break-even. Sales falling further would mean a loss.

Margin of safety as a percentage

$\text{Margin of safety \%} = \frac{\text{Current sales} - \text{Break-even sales}}{\text{Current sales}} \times 100$

Bakery: (1,500 − 1,000) ÷ 1,500 × 100 = 33%.

Why margin of safety matters

A large margin of safety means the firm has resilience — sales can fall significantly before losses begin.
A small margin of safety means the firm is fragile — even small downturns push it into loss.

Industry typical margins of safety

High-fixed-cost industries (airlines, factories, retailers) typically have lower margins of safety.
Low-fixed-cost industries (consulting, software) typically have higher margins of safety.
A margin of safety below 10% is considered risky.

Edexcel application. When analysing a business, the margin of safety reveals VULNERABILITY. A firm with a 5% margin of safety is one bad quarter from losses; a firm with a 40% margin can absorb significant shocks.

Margin of safety = Current sales − Break-even sales.
Also expressible as a percentage of current sales.
Large MoS = resilient; small MoS = fragile.
Useful for assessing vulnerability to falling sales.

See the full worked example for costs and break-even analysis →

Break-even charts

Visual representation of fixed costs, variable costs, total costs, revenue, break-even point and margin of safety.

A break-even chart is a graph showing:

X-axis: output (units).
Y-axis: money (£).
Fixed cost line: horizontal straight line at the fixed-cost level (e.g. £3,000).
Total cost line: starts at the fixed-cost level, slopes upward as variable costs are added.
Total revenue line: starts at the origin (zero output = zero revenue), slopes upward at the selling-price rate.
Break-even point: where the total revenue and total cost lines cross.
Profit area: the triangular area where revenue is above total cost (right of break-even).
Loss area: the triangular area where total cost is above revenue (left of break-even).

Bakery example

£ (000s)
  10 |              Revenue line ──/
   9 |                            /
   8 |                          /
   7 |                       Total cost
   6 |                      /
   5 |________________B-E point
   4 |                   /
   3 |__Fixed cost___ /___
   2 |             /
   1 |          /
   0 |_______/_____________________
     0  500  1k  1.5k  2k  output (loaves)

The two lines cross at 1,000 loaves and £5,000 — the bakery's break-even point.

Reading the chart

To the LEFT of break-even: the firm makes a LOSS (total cost > revenue).
To the RIGHT of break-even: the firm makes a PROFIT (revenue > total cost).
AT break-even: zero profit, zero loss.

Drawing tips for exam questions

Label both axes carefully — output (units) on X, money (£) on Y.
Draw the fixed cost line first (horizontal).
Draw the total cost line starting from the fixed-cost intercept and sloping up at the variable-cost rate.
Draw the revenue line from the origin sloping up at the selling-price rate.
Mark the break-even point clearly with a labelled cross or dot.
Shade or label the profit and loss areas if asked.

What changes shift the break-even point

Higher fixed costs → break-even rises (more units needed to cover the fixed costs).
Lower variable cost per unit → contribution rises → break-even falls.
Higher selling price → contribution rises → break-even falls.
Lower selling price → contribution falls → break-even rises.

Edexcel exam application. Strong answers can predict how the break-even point will move BEFORE doing the calculation: 'rent rising by 20% will raise fixed costs, raising the break-even point by the same proportion'.

Break-even chart: fixed cost line, total cost line, revenue line.
Break-even point = intersection of revenue and total cost lines.
Profit area to the right; loss area to the left.
Higher fixed costs raise break-even; higher contribution lowers it.

See the full worked example for costs and break-even analysis →

Uses and limitations of break-even analysis

Useful for planning, pricing decisions, and risk assessment — but assumes simplification.

Uses of break-even analysis

Decide if a product is viable. If the break-even output exceeds the realistic market size, the product won't work.
Set sales targets. Margin of safety calculation tells managers how many units they need above break-even.
Price decisions. Testing different selling prices to see the effect on break-even.
Investment decisions. New equipment that raises fixed costs but lowers variable costs — the analysis shows the breakeven implication.
Plan finance needs. A high break-even implies large working-capital needs in early months.
Risk assessment. Low margin of safety signals vulnerability to downturns.

Limitations of break-even analysis

Assumes everything produced is sold. In reality, some output goes to stock or waste.
Assumes constant selling price. In reality, prices vary by customer, volume, discounting.
Assumes constant variable cost per unit. In reality, bulk discounts on materials affect costs.
Ignores fixed cost step changes. Above a certain output, you need a second factory, doubling fixed costs.
Static — doesn't account for time. Costs and prices change with inflation, market conditions.
Single-product focus. Most firms sell multiple products with different margins — the simple formula doesn't extend cleanly.
Ignores quality and customer factors. A firm CAN raise output but may damage quality or brand.

Edexcel A* angle. Break-even analysis is a useful SIMPLIFICATION — it gives a quick yes/no on viability but is too simple for detailed strategic decisions. Strong evaluation answers acknowledge both the usefulness AND the limitations.

Uses: viability, sales targets, pricing, investment, finance planning, risk.
Limits: all-sold assumption, constant price/cost, ignores step changes, single product.
Useful screening tool; not a complete strategic decision-making framework.

See the full worked example for costs and break-even analysis →

How it’s examined

Break-even is one of the most heavily examined numerical topics in 4BS1. Expect: 2-mark define fixed/variable cost; 4-mark calculate contribution per unit / calculate break-even point; 6-mark interpret break-even chart / margin of safety; 9-12 mark evaluate the firm's viability or recommend changes that improve break-even. Strong answers: (a) show every calculation step, (b) label units, (c) explain WHY the answer matters for the firm. Easy marks lost when candidates: confuse fixed/variable; forget to subtract variable cost when computing contribution; don't label units in answers.

Sources: Pearson Edexcel International GCSE Business Studies 4BS1 specification (valid for 2026 onwards); Pearson Edexcel 4BS1 Examiner Reports 2022-2024; 4BS1/01 May/Jun 2024 question paper and mark scheme; 4BS1/02 May/Jun 2024 question paper and mark scheme. Last reviewed 2026-05-18.

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Step-by-step worked examples — Costs and break-even Analysis

Step-by-step solutions to past-paper-style questions on costs and break-even analysis, written exactly the way a tutor would explain them at the board.

1Classify costs as fixed or variable (4 marks, Paper 1)
Core• fixed, variable
Question
Classify each of the following as FIXED or VARIABLE cost for a bakery: (a) rent of premises, (b) flour, (c) baker's salary, (d) electricity to run the ovens. (4 marks)
Step-by-step solution
1. Step 1
  (a) Rent — FIXED (1 mark). Paid every month regardless of how many loaves baked.
2. Step 2
  (b) Flour — VARIABLE (1 mark). More loaves = more flour used → cost rises with output.
3. Step 3
  (c) Baker's salary — FIXED (1 mark). Paid the same monthly amount regardless of output.
4. Step 4
  (d) Electricity for ovens — VARIABLE (1 mark). More baking = more oven hours = more electricity. (Though some students might argue semi-variable; pure variable is the cleaner answer here.)
Answer
(a) Rent — fixed. (b) Flour — variable. (c) Baker's salary — fixed. (d) Electricity for ovens — variable. Fixed = doesn't change with output; variable = changes directly with output.
Examiner tip
Each correctly classified item earns 1 mark. Test: if output stopped tomorrow, would the cost stop? YES = variable; NO = fixed.
2Calculate contribution per unit (3 marks, Paper 1)
Core• contribution, calculation
Question
A bakery sells loaves at £5 each. Variable cost per loaf is £2 (flour, yeast, packaging). Fixed costs are £3,000/month. Calculate the contribution per unit and explain its meaning. (3 marks)
Step-by-step solution
1. Step 1
  Formula (1 mark). Contribution per unit = Selling price − Variable cost per unit.
2. Step 2
  Calculation (1 mark). £5 − £2 = £3 per loaf.
3. Step 3
  Meaning (1 mark). Each loaf sold contributes £3 toward covering fixed costs. Once fixed costs are fully covered, every further loaf adds £3 to profit.
Answer
Contribution per unit = £5 − £2 = £3 per loaf. Each loaf contributes £3 toward covering fixed costs (£3,000/month). Once fixed costs are covered, every additional loaf adds £3 of pure profit.
Examiner tip
Show the FORMULA explicitly, the CALCULATION and the MEANING. Each earns a mark. Don't just write the answer.
3Calculate the break-even point (4 marks, Paper 1)
Core• break-even, calculation
Question
Using the bakery data: selling price £5/loaf, variable cost £2/loaf, fixed costs £3,000/month. Calculate the break-even point in units and in revenue (£). (4 marks)
Step-by-step solution
1. Step 1
  Step 1: Contribution per unit (1 mark). £5 − £2 = £3 per loaf.
2. Step 2
  Step 2: Apply break-even formula (1 mark). Break-even (units) = Fixed costs / Contribution per unit = £3,000 / £3 = 1,000 loaves per month.
3. Step 3
  Step 3: Calculate break-even revenue (1 mark). Break-even revenue = Break-even units × Selling price = 1,000 × £5 = £5,000.
4. Step 4
  Step 4: Verify (1 mark). At 1,000 loaves: Revenue = £5,000; Variable cost = 1,000 × £2 = £2,000; Fixed cost = £3,000; Total cost = £5,000. Revenue = Total Cost → break-even confirmed.
Answer
Break-even = Fixed costs / Contribution per unit = £3,000 / £3 = 1,000 loaves/month. Break-even revenue = 1,000 × £5 = £5,000/month. Below 1,000 loaves the bakery makes a loss; above 1,000 it makes a profit.
Examiner tip
Each calculation step = 1 mark. Even if the final answer is wrong, showing the formula and intermediate steps earns process marks. ALWAYS show working.
4Calculate the margin of safety (3 marks, Paper 1)
Core• margin of safety, calculation
Question
The bakery's break-even is 1,000 loaves/month. It currently sells 1,500 loaves/month. Calculate the margin of safety in units and as a percentage of current sales. (3 marks)
Step-by-step solution
1. Step 1
  Margin of safety (units) (1 mark). 1,500 − 1,000 = 500 loaves.
2. Step 2
  Margin of safety as % of current sales (1 mark). 500 / 1,500 × 100 = 33%.
3. Step 3
  Interpretation (1 mark). Sales could fall by 500 loaves (33%) before the bakery hits break-even. Any further fall means a loss. This is a healthy margin of safety — risky if it was below 10-15%.
Answer
Margin of safety = 1,500 − 1,000 = 500 loaves, which is 500/1,500 × 100 = 33% of current sales. Sales could fall by 33% before the bakery hits break-even — a comfortable buffer against downturn.
Examiner tip
Show calculation in BOTH units AND %. Strong answers also INTERPRET (is the margin healthy or risky?). Below 10% = warning; above 30% = strong cushion.
5Interpret a break-even chart (4 marks, Paper 2)
Extended• chart, Paper 2
Question
On a break-even chart, label and interpret: (a) the fixed cost line, (b) the total cost line, (c) the revenue line, (d) the break-even point. (4 marks)
Step-by-step solution
1. Step 1
  (a) Fixed cost line (1 mark). A horizontal straight line at the level of fixed costs (does not change with output). Crosses the Y-axis at the fixed-cost value.
2. Step 2
  (b) Total cost line (1 mark). Starts at the fixed-cost level on the Y-axis and slopes upward at the rate of variable cost per unit. Total cost = fixed cost + variable cost × output.
3. Step 3
  (c) Revenue line (1 mark). Starts at the ORIGIN (zero output = zero revenue) and slopes upward at the rate of selling price per unit.
4. Step 4
  (d) Break-even point (1 mark). Where the revenue line and the total cost line CROSS. To the left = loss zone (cost > revenue); to the right = profit zone (revenue > cost).
Answer
(a) Fixed cost line — horizontal at fixed-cost level. (b) Total cost line — starts at fixed cost, slopes up at variable-cost rate. (c) Revenue line — from origin, slopes up at price rate. (d) Break-even point — intersection of revenue and total cost lines.
Examiner tip
Each line correctly described = 1 mark. Strong answers note: revenue starts at origin (zero); total cost starts at fixed-cost level. The break-even point is the intersection.
6Discuss uses and limitations of break-even analysis (6 marks, Paper 2)
Extended• uses, limitations, Paper 2
Question
Discuss the uses and limitations of break-even analysis for a business making decisions. (6 marks)
Step-by-step solution
1. Step 1
  Use 1 — Viability check (1 An). Compare break-even output to realistic market size: if break-even is 10,000 units but the market is only 5,000, the business won't work.
2. Step 2
  Use 2 — Pricing decisions (1 An). Different selling prices give different contribution per unit and different break-even points. Helps test pricing strategies.
3. Step 3
  Use 3 — Investment decisions (1 An). A new machine that lowers variable cost per unit but raises fixed costs — the break-even change shows whether worth it.
4. Step 4
  Limitation 1 — Assumes everything is sold (1 An). In reality some output is wasted or held in stock; the model assumes all production becomes sales.
5. Step 5
  Limitation 2 — Assumes constant prices and costs (1 An). Bulk discounts on materials, dynamic pricing, seasonal demand all violate this.
6. Step 6
  Limitation 3 — Single product focus (1 An). Most firms sell many products with different margins; simple break-even doesn't handle this cleanly.
Answer
USES: viability check, pricing decisions, investment decisions, finance planning, risk assessment. LIMITATIONS: assumes everything sold, constant prices/costs, ignores step changes in fixed costs, single-product focus. Useful starting point but not a complete strategic tool.
Examiner tip
Strong answers cover BOTH uses and limitations. The balance (it's useful BUT limited) is the analytical move that pushes to L3+.

Key Formulae — Costs and break-even Analysis

The formulae you need to memorise for costs and break-even analysis on the Pearson Edexcel IGCSE 4BS1 paper, with every variable defined in plain English and a note on when to use it.

Total cost
$TC = FC + VC$
$TC$
Total cost
$FC$
Fixed costs
$VC$
Total variable costs (= variable cost per unit × output)
When to use
To calculate the total cost of producing a given output level.
Example
FC = £3,000/month; VC per unit = £2; output = 1,500 units. Total VC = 1,500 × £2 = £3,000. TC = £3,000 + £3,000 = £6,000.
Revenue
$R = P \times Q$
$R$
Total revenue
$P$
Price per unit
$Q$
Quantity sold
When to use
To calculate income from sales.
Example
Selling 1,500 loaves at £5 each → R = 1,500 × £5 = £7,500.
Profit
$\text{Profit} = R - TC$
$Profit$
Profit (or loss if negative)
$R$
Revenue
$TC$
Total cost
When to use
To calculate the profit (or loss) of the business at a given output level.
Example
R = £7,500; TC = £6,000. Profit = £7,500 − £6,000 = £1,500.
Contribution per unit
$\text{Contribution} = P - VC_{u}$
$Contribution$
Contribution per unit (£)
$P$
Selling price per unit
$VC_u$
Variable cost per unit
When to use
To calculate how much each unit contributes to fixed costs and profit.
Example
P = £5; VC per unit = £2. Contribution = £5 − £2 = £3 per unit.
Break-even point (units)
$BE = \frac{FC}{\text{Contribution per unit}}$
$BE$
Break-even output in units
$FC$
Fixed costs
When to use
To calculate the level of output where total revenue equals total cost (no profit, no loss).
Example
FC = £3,000; Contribution per unit = £3. BE = £3,000 / £3 = 1,000 units.
Margin of safety
$MoS = \text{Current sales} - \text{Break-even sales}$
$MoS$
Margin of safety (in units)
$Current sales$
Actual sales in units
$Break-even sales$
Break-even point in units
When to use
To measure how much sales can fall before the business stops being profitable.
Example
Current sales = 1,500 loaves; BE = 1,000 loaves. MoS = 1,500 − 1,000 = 500 loaves. As a % of current sales: 500/1,500 × 100 = 33%.

Model Answers — Costs and break-even Analysis

High-scoring sample answers for costs and break-even analysis on the Pearson Edexcel IGCSE 4BS1 paper, with examiner-style notes mapping each response to the mark scheme and assessment objectives.

Question 1
4BS1-style — Paper 1, 8 mark explain8 marks
Explain what break-even analysis is and why it is useful for a new small business. (8 marks)
Model answer
Break-even analysis is one of the most useful financial tools for any new small business. It tells the founder, in clear numbers, the minimum level of output they need to achieve to avoid making a loss — and how much above this they need to go to generate the profit they want. For a start-up where every assumption is being tested for the first time, this clarity is invaluable.

What break-even is

The break-even point is the output level where TOTAL REVENUE equals TOTAL COSTS. At break-even, the business makes neither profit nor loss. Below break-even, every unit lost is a loss. Above break-even, every unit sold adds to profit (specifically, the contribution per unit).

The formula

Break-even (units) = Fixed costs / Contribution per unit

where Contribution per unit = Selling price − Variable cost per unit.

This formula works because each unit sold contributes the gap between its selling price and its variable cost. When enough units have been sold for total contribution to cover total fixed costs, fixed costs are fully covered → break-even.

Worked example — a new café

Fixed costs: rent £2,000 + manager salary £2,500 + insurance £500 = £5,000/month.

Selling price: average customer spend £10.

Variable cost: ingredients + packaging per customer £4.

Contribution per customer = £10 − £4 = £6.

Break-even = £5,000 / £6 = 833 customers per month (≈ 28 customers per day).

Why this is useful for a new small business

Validation check. If 833 customers per month is realistic for the café's location and size, the business is viable. If 833 is impossible (e.g. the café seats 20 people and would need 42 customers a day), the business won't work — better to know before investing.

Pricing decisions. Testing different prices shows the break-even sensitivity. £12 average spend with same costs → contribution rises to £8 → break-even falls to 625 customers. Pricing has dramatic effect on break-even.

Sales targets. The owner now has a clear daily target (28 customers); staff and marketing can be focused on hitting it.

Finance planning. The owner knows how much working capital they need to survive the first months while building to break-even. If break-even takes 3 months to reach, they need 3 months of fixed costs (£15,000) in cash to survive the launch.

Investment decisions. A new espresso machine for £3,000 that adds £1 to contribution per customer means break-even falls by 14% (the £3k is one-off, but the saving recurs every customer). Whether worth it can be calculated.

Risk assessment. A break-even close to maximum capacity means the business is fragile — small drops in sales cause losses. A break-even comfortably below capacity means resilience.

Limitations to flag

Break-even assumes all output is sold (not always true).

Assumes constant prices and costs (in reality both vary).

Single-product focus — most cafés sell many items with different margins.

Static — doesn't account for inflation, seasonal change, customer trends.

But for a NEW small business, these limitations matter less. The break-even calculation is a rough but powerful first test of business viability. Many failed start-ups would have been avoided if the founder had done the calculation honestly and recognised the impossibility before launching.

Conclusion. Break-even analysis is a quick, simple, powerful test of business viability. For a new small business, calculating break-even — and being honest about whether it's achievable — is one of the most valuable financial exercises the founder can do. The calculation itself takes minutes; the discipline of using it can save years of failed investment.
Why this scores
L3 (7-8) on 8-mark explain requires: clear definition, formula, worked example, multiple uses, brief mention of limitations. The 'better to know before investing' framing is the L3+ insight.
Question 2
4BS1-style — Paper 1, 9 mark discuss9 marks
A bakery has fixed costs of £3,000/month, selling price £5/loaf and variable cost £2/loaf. Its current sales are 1,500 loaves/month. Discuss the impact of (a) raising the selling price to £6, and (b) rising flour costs adding £0.50 to the variable cost. (9 marks)
Model answer
Both changes affect the bakery's contribution per unit and therefore its break-even point and profit. The numerical impact is clear; the strategic implications are more interesting.

Baseline (current position)

Contribution per unit = £5 − £2 = £3.

Break-even = £3,000 / £3 = 1,000 loaves/month.

Current sales 1,500 → Margin of safety = 500 loaves (33%).

Current profit = 500 × £3 = £1,500/month.

Scenario (a) — Raise selling price to £6

New contribution per unit = £6 − £2 = £4.

New break-even = £3,000 / £4 = 750 loaves/month (FELL by 250).

IF current customer demand of 1,500 holds: profit = (1,500 − 750) × £4 = £3,000. Profit DOUBLES.

IF demand falls to, say, 1,200 (customers leave at higher price): profit = (1,200 − 750) × £4 = £1,800. Still UP from baseline.

IF demand falls to 1,000: profit = (1,000 − 750) × £4 = £1,000. DOWN from baseline.

IF demand falls to 750: zero profit (break-even).

Risk analysis for (a): The price rise improves contribution per unit and lowers break-even. The profit impact depends on price elasticity of demand:

If customers are loyal / price-insensitive → big profit gain.

If competitors are nearby and cheaper → customers leave → profit may fall.

Strong management of this decision: test the price rise in a small experiment first; segment the customer base (regulars who'll pay more; new customers who may not).

Scenario (b) — Rising flour cost adds £0.50 to variable cost

New variable cost per loaf = £2 + £0.50 = £2.50.

New contribution per unit = £5 − £2.50 = £2.50 (FELL by £0.50).

New break-even = £3,000 / £2.50 = 1,200 loaves/month (UP by 200).

IF sales remain 1,500: profit = (1,500 − 1,200) × £2.50 = £750. Profit nearly HALVES.

Margin of safety drops from 500 to 300 loaves (20%) — significantly less buffer.

Risk analysis for (b): The cost rise reduces margin and raises break-even. The bakery's options:

Absorb the cost (profit falls) — viable only if reserves allow.

Pass to customers (raise prices) — works only if customers stay.

Find a cheaper supplier or substitute ingredient — protects margin but may affect quality.

Reduce other costs (packaging, energy) — limited possibility.

Comparing the two scenarios

Metric Baseline (a) Price ↑ (b) Cost ↑
Contribution per unit £3 £4 £2.50
Break-even (loaves) 1,000 750 1,200
Profit at 1,500 sales £1,500 £3,000 £750
Margin of safety 500 (33%) 750 (50%) 300 (20%)

Scenario (a) IMPROVES the bakery's economics on every metric (if demand holds). Scenario (b) WORSENS them.

The interaction the question doesn't directly ask but is critical

In real life, BOTH scenarios are likely to happen simultaneously. Flour costs rise (b) — the bakery is forced to consider raising price (a). The combined position depends on how much price rise is needed to maintain margin.

To maintain the original £3 contribution per unit after the £0.50 cost rise, the bakery needs to raise price from £5 to £5.50. This is a 10% price rise — manageable if customers don't notice / care.

Justified judgement

Scenario (a) alone is a positive change IF demand holds — manageable risk for a bakery with a loyal customer base.

Scenario (b) alone is harmful and requires action — either pass the cost on (raise price), find cheaper inputs, or accept reduced margins.

In reality, the bakery's best response is to:

Absorb small cost rises where possible to maintain customer loyalty.

Pass on larger cost rises through measured price increases (e.g. round up to nearest £0.50) and communicate honestly to customers.

Hedge flour costs where possible (longer-term supply contracts).

Monitor competitor responses to price changes.

Conclusion. The two scenarios show how sensitive break-even is to contribution per unit. A £1 price rise drops break-even by 25%; a £0.50 cost rise raises it by 20%. Small changes in either direction have large profit implications. The bakery needs to manage BOTH price and cost actively — they are the two levers most directly controlling profitability.
Why this scores
9-mark discuss requires CALCULATION of impacts + interpretation + judgement. The comparison table and the 'real life both happen simultaneously' insight push the answer to top of L3.
Question 3
4BS1-style — Paper 2, 12 mark evaluate12 marks
A small clothing manufacturer has fixed costs of £20,000/month, sells dresses at £40 each with variable cost £15. It currently sells 1,000 dresses/month. The owner is considering an automation investment of £100,000 that would (i) raise fixed costs by £3,000/month (depreciation + maintenance) but (ii) reduce variable cost per dress to £8. Evaluate whether to invest. (12 marks)
Model answer
An automation investment that trades higher fixed costs for lower variable costs is one of the classic financial decisions a manufacturer faces. The numbers can be calculated precisely; the judgement turns on demand assumptions and strategic risks. This evaluation will work through both.

Step 1: Calculate the current position

Contribution per unit = £40 − £15 = £25.

Break-even = £20,000 / £25 = 800 dresses/month.

Current sales 1,000 → margin of safety = 200 (20%).

Current profit = (1,000 − 800) × £25 = £5,000/month.

Step 2: Calculate the post-automation position

New fixed costs = £20,000 + £3,000 = £23,000/month.

New variable cost = £8, so contribution per unit = £40 − £8 = £32.

New break-even = £23,000 / £32 = 719 dresses/month (FELL by 81).

If sales remain 1,000: profit = (1,000 − 719) × £32 = £8,992/month. Profit nearly DOUBLES.

Annual extra profit: (£8,992 − £5,000) × 12 = £47,904.

Payback period on £100k investment: £100,000 / £47,904 = ~2.1 years.

Step 3: Sensitivity analysis — what if demand falls?

If sales fall to 750 (a 25% drop):

Without automation: profit = (750 − 800) × £25 = −£1,250 (loss).

With automation: profit = (750 − 719) × £32 = £992 (small profit).

Automation makes the business MORE resilient to a downturn (lower break-even AND higher contribution per unit).

If sales fall to 600 (a 40% drop):

Without automation: profit = (600 − 800) × £25 = −£5,000 (significant loss).

With automation: profit = (600 − 719) × £32 = −£3,808 (significant loss but smaller).

Even in a severe downturn, automation reduces the loss.

Step 4: Sensitivity analysis — what if demand rises?

If sales rise to 1,500 (a 50% increase):

Without automation: profit = (1,500 − 800) × £25 = £17,500.

With automation: profit = (1,500 − 719) × £32 = £24,992.

Automation captures MORE of upside growth because each additional unit contributes £32 instead of £25.

Step 5: Risks the calculation doesn't show

Capital outlay £100,000. Where does the money come from? Bank loan? Retained profit? The cash impact is up-front; payback over 2 years.

Automation often disrupts during installation. 1-3 months of lower output is typical.

Workforce implications. Reducing variable labour cost by £7 per dress likely means redundancies. HR/legal costs; employee morale damage; reputational risk.

Technology obsolescence. New machinery becomes outdated; depreciation may understate the real wearing-out rate.

Maintenance and downtime. Automated equipment requires technicians; downtime when it breaks can be costly.

Loss of flexibility. Manual processes can be redirected easily; automated processes are committed to a specific product.

Quality changes. Automated production is usually more consistent but less able to handle custom orders.

Step 6: Strategic considerations

Competitor response. If competitors also automate, the cost advantage erodes; if they don't, the firm gains pricing power.

Customer demand stability. Investment is best when demand is predictable. Volatile demand makes the fixed-cost commitment riskier.

Brand positioning. 'Handcrafted' brands lose value if they automate; commodity brands benefit.

Justified judgement

The investment should likely proceed, but with three conditions:

Demand assumption tested. The 1,000 dresses/month baseline must be sustainable. If recent trend is down, automate AFTER demand stabilises.

Financing structured carefully. £100k from a 3-5 year bank loan is sensible — matches the asset life and payback period. Don't drain working capital.

Workforce plan. Talk to staff about the change; redeploy where possible (e.g. retrain operators to be quality/maintenance technicians). Reduces the moral and legal risks of automation.

Quantitative case:

2.1-year payback is acceptable (under 3 years is generally good).

Profit nearly doubles at current demand.

Resilience to downturns IMPROVES (lower break-even).

Upside capture INCREASES (higher contribution per unit).

The mathematical case is strongly positive in nearly all scenarios. The risks (capital, workforce, flexibility) are real but manageable with planning.

What would change the decision?

If the firm sold 'handcrafted' dresses at premium prices, automation would destroy brand value — don't invest.

If demand was falling, automating now adds fixed costs at the wrong time — wait.

If financing was difficult, the £100k outlay could stress cash — sequence the investment.

Conclusion. The automation investment should proceed. It pays back in ~2 years, doubles profit at current sales, improves resilience to downturns, and captures more upside if growth happens. The risks (workforce, flexibility, financing) are real but manageable with planning. The mistake would be to delay due to risk aversion — competitors with similar economics will eventually automate, and the firm that delays loses competitive position.

The deeper insight is that automation decisions are economic ratchets — they shift cost structures from variable to fixed, which improves margins at higher volumes but reduces flexibility at lower volumes. The firm trades short-term flexibility for long-term efficiency. This trade is right for stable, growing demand; wrong for volatile or declining demand. Reading which condition the firm is in is the strategic skill.
Why this scores
L4 (10-12) requires: full numerical analysis, sensitivity tests (demand up AND down), risk identification, financing plan, conditional recommendation. The 'automation as economic ratchet' meta-insight is the L4+ refinement.
Question 4
4BS1-style — Paper 2, 12 mark evaluate (challenge)12 marks
A bakery sells three products: standard bread (£5, variable cost £2), gourmet bread (£10, variable cost £4) and pastries (£3, variable cost £1). Fixed costs are £6,000/month. Current monthly sales: 800 standard bread, 200 gourmet bread, 1,000 pastries. The owner is debating whether to (a) push standard bread harder, (b) push gourmet bread harder, or (c) drop pastries and focus on bread. Evaluate which strategy is best. (12 marks) — CHALLENGE QUESTION
Model answer
Multi-product break-even is significantly more complex than single-product. The traditional break-even formula doesn't apply cleanly because each product has different contribution. The owner must think in terms of total contribution and product mix, not just per-product break-even. This evaluation demonstrates the kind of nuanced analysis that distinguishes professional financial thinking.

Step 1: Calculate contribution per product

Product Price Var cost Contribution per unit
Standard bread £5 £2 £3
Gourmet bread £10 £4 £6
Pastries £3 £1 £2

Step 2: Calculate current total contribution

Standard: 800 × £3 = £2,400

Gourmet: 200 × £6 = £1,200

Pastries: 1,000 × £2 = £2,000

Total contribution = £5,600/month

Fixed costs = £6,000/month

Profit (loss) = £5,600 − £6,000 = LOSS of £400/month

The bakery is currently making a small LOSS — important context the question doesn't make explicit. Any strategy must move the bakery into profit, not just improve.

Step 3: Evaluate Option (a) — push standard bread harder

Standard bread contribution per unit = £3. If the bakery can sell 200 more standard loaves (to 1,000/month):

Extra contribution = 200 × £3 = £600

New total contribution = £5,600 + £600 = £6,200

New profit = £6,200 − £6,000 = £200

Standard bread has the LOWEST contribution per unit but highest current volume. Each additional loaf adds £3.

Step 4: Evaluate Option (b) — push gourmet bread harder

Gourmet bread contribution per unit = £6 (twice the standard). If the bakery can sell 100 more gourmet loaves (to 300/month):

Extra contribution = 100 × £6 = £600

New total contribution = £5,600 + £600 = £6,200

New profit = £6,200 − £6,000 = £200

Selling 100 MORE gourmet loaves achieves the same profit improvement as 200 MORE standard loaves. Higher contribution per unit = less effort needed per £ of profit.

However, gourmet bread starts from a smaller base (200 vs 800), suggesting the customer base for gourmet is limited. Doubling gourmet sales to 400 might be ambitious.

Step 5: Evaluate Option (c) — drop pastries

This is the trap option. Pastries contribute £2 per unit and currently generate £2,000 of contribution monthly. Dropping them means:

LOSS of £2,000 contribution.

Even if standard and gourmet rise to compensate, the bakery loses the £2,000 immediately.

This option only makes sense if dropping pastries FREES UP CAPACITY or RESOURCES that can be redirected to higher-contribution products. If oven space, staff time and ingredients are freed up that ENABLE a 300+ unit increase in bread sales, then maybe. But on the simple math: dropping a contributing product makes the bakery WORSE OFF.

Pastries are the lowest contribution per unit (£2) but they STILL contribute. Dropping them is wrong unless their resources can be redirected to genuinely higher-contribution use.

Step 6: The deeper analysis — contribution per limiting factor

The simple comparison of contribution per UNIT misses an important consideration: what is the limiting factor? In a bakery, common limits are:

Oven time (each product takes different baking time).

Staff hours (each product requires different preparation).

Customer demand (each product has its own customer base).

If gourmet bread takes 3x the oven time of standard bread, then per oven-hour, gourmet's contribution is £6/3 = £2/oven-hour vs standard's £3/1 = £3/oven-hour. Standard wins per oven-hour. This is contribution per limiting factor analysis — the true professional approach.

Without information on limiting factors, the simple contribution-per-unit ranking favours gourmet, but the real answer depends on what's actually constraining the bakery.

Step 7: Combined strategy recommendation

The right answer is NOT to choose just one option but to:

Keep all three products. Each contributes; none should be dropped without freeing significantly higher-contribution use of the freed resources.

Marketing focus on gourmet bread. Per unit of effort, gourmet bread yields twice the contribution of standard bread. Premium positioning, social-media marketing, partnerships with restaurants/cafes could expand gourmet sales beyond their current low base.

Maintain standard bread base. Standard bread is the volume backbone; don't reduce.

Optimise pastries. Even at £2 contribution, pastries should not be dropped. They likely attract customers who also buy bread (cross-sell). They also use otherwise-idle morning oven time and staff capacity.

Test price increases on pastries. £3 → £3.50 raises contribution from £2 to £2.50 (25% increase). If volume holds, contribution rises significantly.

Quantified target

Push gourmet from 200 → 350 (+£900 contribution).

Maintain standard at 800 (or push to 850, +£150).

Maintain or raise pastry prices to lift contribution per unit (+£500 if all assumptions hold).

Total contribution rise: £900 + £150 + £500 = ~£1,550.

New total contribution: £5,600 + £1,550 = £7,150.

New profit: £7,150 − £6,000 = £1,150/month vs current £400 LOSS.

Justified judgement

The right strategy is multi-pronged with gourmet as the primary growth lever:

Marketing focus: gourmet bread.

Price optimisation: pastries.

Volume support: standard bread.

Pure single-product strategies (focus only on standard, or only on gourmet, or drop pastries) all miss opportunities. The portfolio thinking — recognising that different products serve different roles in the business — is the strategic move.

Conclusion. The bakery should not pick ONE option but pursue a combined strategy: push gourmet bread (highest contribution per unit, low current volume), maintain standard bread (volume backbone), and selectively raise pastry prices (lift contribution per unit). Dropping pastries entirely is the trap option — even low-contribution products are losses if removed without replacement. The bakery moves from a £400 loss to a ~£1,150 profit within months.

The deeper insight is that multi-product break-even analysis requires PORTFOLIO thinking, not single-product thinking. Each product plays a role — some are volume drivers, some are margin generators, some are customer attractors. The professional approach is to optimise the portfolio mix, not to push or drop products in isolation. This is the kind of analysis professional finance teams do daily; the IGCSE level just introduces the concept, but the framework scales to A-Level, university and corporate finance.
Why this scores
CHALLENGE-level model. A*+ features: (1) recognises bakery is currently at a LOSS (calculation), (2) calculates impact of each option with numerical precision, (3) introduces 'contribution per limiting factor' concept as the deeper analytical frame, (4) rejects single-product strategies as missing portfolio value, (5) gives a quantified target with specific moves and projected outcome, (6) closes with meta-insight about portfolio thinking. The mathematical rigour combined with strategic synthesis is what defines top of L4.

Metric	Baseline	(a) Price ↑	(b) Cost ↑
Contribution per unit	£3	£4	£2.50
Break-even (loaves)	1,000	750	1,200
Profit at 1,500 sales	£1,500	£3,000	£750
Margin of safety	500 (33%)	750 (50%)	300 (20%)

Product	Price	Var cost	Contribution per unit
Standard bread	£5	£2	£3
Gourmet bread	£10	£4	£6
Pastries	£3	£1	£2

Key Definitions and Keywords — Costs and break-even Analysis

Definitions to memorise and the exact keywords mark schemes credit for costs and break-even analysis answers — sharpened from recent examiner reports for the 2026 Pearson Edexcel IGCSE 4BS1 sitting.

Fixed cost
Examiner keyword
A cost that does not change with the level of output — rent, salaries, insurance, business rates, depreciation, loan interest.
Variable cost
Examiner keyword
A cost that changes directly with the level of output — raw materials, piece-rate wages, packaging, sales commission.
Total cost
Examiner keyword
Fixed cost + Variable cost for a given output level.
Revenue
Examiner keyword
Money earned from selling goods or services. Revenue = Selling price × Quantity sold.
Profit
Examiner keyword
Revenue − Total cost. Negative profit is called a loss.
Contribution per unit
Examiner keyword
Selling price − Variable cost per unit. The amount each unit contributes toward covering fixed costs and then profit.
Break-even point
Examiner keyword
The level of output at which Total revenue = Total cost — no profit, no loss. Formula: Fixed costs / Contribution per unit.
Margin of safety
Examiner keyword
The amount by which current sales exceed break-even sales — a buffer against falling demand. Often expressed as a percentage of current sales.
Break-even chart
A graph showing fixed costs, total costs and total revenue against output, with the break-even point at the intersection of revenue and total cost lines.

Common Mistakes and Misconceptions — Costs and break-even Analysis

The traps other students keep falling into on costs and break-even analysis questions — taken from recent Pearson Edexcel IGCSE 4BS1 examiner reports and mark schemes — and how to avoid them.

✕Confusing fixed and variable costs
4BS1 Examiner Reports 2022-2024
Why it happens
Some costs (semi-variable) blur the line; some students don't think systematically.
How to avoid it
Test: 'if output stopped tomorrow, would this cost stop?' YES = variable; NO = fixed. Rent (NO → fixed); raw materials (YES → variable).
✕Writing only the final answer without showing the working
Why it happens
Students focus on getting to the answer.
How to avoid it
Always show: formula → calculation → answer with units. Each step earns a mark; even a wrong final answer gets process marks for correct working.
✕Calculating contribution per unit by SUBTRACTING price from variable cost (wrong direction)
Why it happens
Students confuse which order subtraction goes.
How to avoid it
Contribution = SELLING PRICE − VARIABLE COST PER UNIT. Always price minus cost (price is bigger). Negative contribution means selling below variable cost — not a real situation in normal trading.
✕Giving numerical answers without units (loaves, dresses, £)
Why it happens
Students treat it as a pure maths exercise.
How to avoid it
Always label answers with units: '1,000 loaves per month' not '1,000'. '£5,000 revenue' not '5,000'. The label confirms understanding.
✕Computing break-even using only fixed cost or only variable cost
Why it happens
Students forget to take contribution per unit (which requires BOTH).
How to avoid it
Break-even formula needs contribution per unit (selling price − variable cost). Make sure both pieces of information are used. Check: contribution should always be positive.

Practice questions

Exam-style questions with step-by-step worked solutions. Try one before checking the method.

Past paper style quiz

Get a report showing which sub-topics you've nailed and which ones still need work.

Costs and break-even Analysis — frequently asked questions

The things students keep getting wrong in this sub-topic, answered.

Costs and break-even Analysis

Short Study Notes in the form of Slides

Short Study Notes — Costs and break-even Analysis

Detailed Notes

What you’ll learn

How it’s examined

1Classify costs as fixed or variable (4 marks, Paper 1)

2Calculate contribution per unit (3 marks, Paper 1)

3Calculate the break-even point (4 marks, Paper 1)

4Calculate the margin of safety (3 marks, Paper 1)

5Interpret a break-even chart (4 marks, Paper 2)

6Discuss uses and limitations of break-even analysis (6 marks, Paper 2)

Total cost

Revenue

Profit

Contribution per unit

Break-even point (units)

Margin of safety

Fixed cost

Variable cost

Total cost

Revenue

Profit

Contribution per unit

Break-even point

Margin of safety

Break-even chart

✕Confusing fixed and variable costs

✕Writing only the final answer without showing the working

✕Calculating contribution per unit by SUBTRACTING price from variable cost (wrong direction)

✕Giving numerical answers without units (loaves, dresses, £)

✕Computing break-even using only fixed cost or only variable cost

Practice questions

Past paper style quiz

Assess your understanding

Costs and break-even Analysis — frequently asked questions