Cost of sales is the direct cost of the goods or services sold. Gross profit = sales revenue − cost of sales. Compare figures for the same period.
Net profit, using the GCSE model, is gross profit less other operating expenses and interest. Use the categories stated in the question and avoid subtracting a cost twice.
Revenue is not profit, gross profit is not net profit, and neither is the same as cash available. A profitable sale on credit may not yet have generated a cash receipt.
Worked example: a shop has revenue £80,000 and cost of sales £48,000. Gross profit = £80,000 − £48,000 = £32,000. Other operating expenses and interest total £20,000, so net profit = £12,000.
Gross profit can rise through higher sales, suitable prices or lower cost of sales. The effect of a price rise depends on how customers respond and what happens to volume.
Net profit can change even when gross profit is unchanged, for example if rent or interest increases. Identify which stage of the calculation a change affects.
Profit is an absolute money value; profitability compares profit with another measure, such as revenue. A larger profit alone does not show that the business is more efficient.
Use calculations to support an explanation. Identify the cause and likely consequence rather than just repeating that profit increased or decreased.
2.4.1 · Profit margins
Gross profit margin (%) = gross profitsales revenue × 100. It shows the proportion of revenue left after cost of sales.
Net profit margin (%) = net profitsales revenue × 100. It shows the proportion remaining after the expenses included in the GCSE net-profit calculation.
Worked example: for the shop above, gross margin = 32,00080,000 × 100 = 40%. Net margin = 12,00080,000 × 100 = 15%. Each £1 of revenue leaves 40p gross profit and 15p net profit. Revenue, costs and profit
Margins allow comparisons between businesses or years with different sales values. Check accounting categories and business activities before assuming a higher margin means a better overall business.
A falling gross margin might reflect discounting or rising material costs. A falling net margin with stable gross margin may point to higher operating expenses or interest.
Increasing margin is not the only objective. A lower margin on a larger volume can generate more total profit; compare the figures and capacity constraints.
Worked example: 15% net margin on £80,000 revenue gives £12,000 profit. A 12% margin on £120,000 gives £14,400. Margin falls but total profit rises.
Distinguish percentage points from percentage change. A margin rising from 10% to 15% increases by five percentage points; relative to its original level, it rises by 50%.
Avoid rounding intermediate values unnecessarily. State the final percentage to the accuracy required and explain what it means in the case.
2.4.1 · Average rate of return
Average rate of return (ARR) compares an investment's average annual profit with its initial cost. ARR (%) = average annual profitcost of investment × 100.
Average annual profit = total profit over the stated project life ÷ number of years. ARR is an average yearly percentage, not the total return over the whole project.
If figures are stated as extra revenue or cash inflows rather than profit, deduct the relevant costs and initial investment as appropriate to establish total project profit. Do not deduct an investment twice if total profit is already given.
Worked example: a machine costs £20,000 and is forecast to generate total profit of £12,000 over four years. Average annual profit = £3,000; ARR = 3,00020,000 × 100 = 15%.
Worked example: an investment costs £10,000 and generates £16,000 of net returns before recovering that initial cost over three years. Total profit = £6,000; average annual profit = £2,000; ARR = 20%.
A higher forecast ARR may make an investment more attractive, but it does not show when the returns arrive or whether the business can afford the initial cost.
Forecast profit is uncertain. Consider demand, costs, reliability, risk and non-financial effects such as quality, staff skills or environmental impact alongside ARR.
Compare options using the same calculation basis. A recommendation should explain why the expected return is suitable for the business and which forecast assumption most affects it.
2.4.2 · Understanding business performance
Quantitative data are numerical evidence, including revenue, profit, margins, sales volumes, market share and research results. Qualitative evidence explains experiences, opinions or causes.
Graphs and charts can reveal trends and comparisons. Read the title, period, axes, units and scale; a shortened vertical axis can exaggerate the visual size of a change.
Financial data help assess revenue, costs, profitability and cash. Marketing data can indicate which campaigns or products attract customers; market data place performance in the context of competitors and total demand.
Percentage change = new value − original valueoriginal value × 100. A negative result is a fall. Use the original value as the denominator.
Worked example: sales rise from £50,000 to £60,000. Percentage change = 10,00050,000 × 100 = 20%. If the whole market rose by 30%, the business's market share may still have fallen.
An average summarises data but can hide variation. A high mean monthly sales figure may conceal several months with cash shortages; seasonal patterns matter.
Past figures do not guarantee future performance. Unexpected competitors, economic changes or inaccurate records can make a decision based only on historic numbers unreliable.
Forecasts depend on assumptions. Check sample size, period, reliability and whether data cover the decision being made; large amounts of irrelevant data do not remove uncertainty.
Financial information may omit reputation, employee morale, product quality and sustainability. These can affect future performance and should be considered with the numbers.
Fictional judgement: a retailer's profit rises after reducing staff, but complaints and delivery delays increase. The immediate saving may be outweighed by lost future sales; investigate repeat purchases before concluding the cut succeeded.
Use evidence to build an argument: identify a pattern, explain a possible business cause, show the consequence, then make a supported judgement. A correlation alone does not prove the cause.
Test yourself
40 questions · Random sets of 10. Type numerical answers without currency or percentage symbols unless instructed. These quick checks support revision; practise extended explanations and justified judgements too.
Mr Kidman's Classroom