What are the main profitability ratios in O-Level Principles of Accounts?

The gross profit margin is gross profit divided by sales, as a percentage, measuring trading profitability. The profit margin (net profit margin) is profit for the year divided by sales, as a percentage, measuring overall profitability after expenses. The return on capital employed is profit for the year divided by capital, as a percentage, measuring how well the owner's investment generates profit.

What is the difference between the current ratio and the quick ratio?

The current ratio is current assets divided by current liabilities, measuring whether short-term assets cover short-term debts. The quick (acid-test) ratio is current assets less inventory, divided by current liabilities, which removes inventory because it is the least liquid current asset. The quick ratio is a stricter test of whether a business can pay its debts without relying on selling inventory.

How are the efficiency ratios calculated?

Inventory turnover is cost of sales divided by average inventory, showing how many times inventory is sold and replaced in a period. The receivables collection period is trade receivables divided by credit sales, times the number of days, showing how long customers take to pay. The payables payment period is trade payables divided by credit purchases, times the number of days, showing how long the business takes to pay suppliers.

Why do you interpret ratios rather than just calculate them?

A ratio on its own is just a number; its meaning comes from comparison, with a previous period, with another business, or with a benchmark. Interpretation explains whether profitability, liquidity or efficiency is improving or worsening and suggests why, which is what supports advice to a user. The O-Level papers award marks for the calculation and, separately, for the interpretation.

What are the limitations of ratio analysis?

Ratios use historical figures, so they may not reflect current conditions; they ignore non-financial factors such as staff quality and market changes; they can be distorted by different accounting policies, by inflation, and by one-off events; and a single ratio in isolation can mislead. Ratios should be used together and alongside other information, not relied on alone.

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Financial statement analysis and ratios: O-Level Principles of Accounts (SEAB/Cambridge 7087), covering the profitability ratios (gross profit margin, profit margin and return on capital), the liquidity ratios (current and quick), the efficiency ratios (inventory turnover and the receivables and payables periods), and interpreting the statements with the limitations of ratio analysis

An O-Level Principles of Accounts (SEAB 7087) overview of financial statement analysis and ratios: the profitability ratios, the liquidity (current and quick) ratios, the efficiency ratios (inventory turnover and the receivables and payables periods), and interpreting the statements with the limitations of ratio analysis.

Generated by Claude Opus 4.87 min readSEAB-7087Updated 2026-06-13

Reviewed by: AI editorial process; not yet individually human-reviewed

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Turning statements into judgements
Profitability and liquidity
Efficiency and interpretation
Check your knowledge

Turning statements into judgements

Once the financial statements are prepared, the final skill in O-Level Principles of Accounts (SEAB/Cambridge 7087) is reading them. Ratio analysis turns the figures into measures of profitability, liquidity and efficiency, and interpretation turns those measures into advice. The 7087 papers reward both moves: a correct ratio and a clear explanation of what it means and what its limits are. This is where preparation and judgement meet.

This guide links the four dot points of the module. The subject hub is at /sg-o-level/accounting and the syllabus index at /sg-o-level/accounting/syllabus.

Profitability and liquidity

The profitability ratios dot point covers the gross profit margin, the profit margin and the return on capital. For example, the gross profit margin is

\text{gross profit margin} = \frac{\text{gross profit}}{\text{sales}} \times 100\%.

The liquidity ratios dot point covers the current ratio and the quick (acid-test) ratio:

\text{current ratio} = \frac{\text{current assets}}{\text{current liabilities}}, \qquad \text{quick ratio} = \frac{\text{current assets} - \text{inventory}}{\text{current liabilities}}.

Efficiency and interpretation

The efficiency and working capital dot point covers inventory turnover and the receivables and payables periods, which show how well the business manages inventory, customers and suppliers. The interpreting financial statements dot point shows how to use the ratios together to advise a user and explains the limitations of ratio analysis.

Calculating and interpreting key ratios

step 1: gross profit margin

Gross profit $\text{S\textdollar}36{,}000$ , sales $\text{S\textdollar}90{,}000$ .

\text{gross profit margin} = \frac{\text{S\textdollar}36{,}000}{\text{S\textdollar}90{,}000} \times 100\% = 40\%.

step 2: profit margin

Profit for the year $\text{S\textdollar}13{,}500$ , sales $\text{S\textdollar}90{,}000$ .

\text{profit margin} = \frac{\text{S\textdollar}13{,}500}{\text{S\textdollar}90{,}000} \times 100\% = 15\%.

step 3: current and quick ratios

Current assets $\text{S\textdollar}48{,}000$ (including inventory $\text{S\textdollar}18{,}000$ ), current liabilities $\text{S\textdollar}24{,}000$ .

\text{current ratio} = \frac{\text{S\textdollar}48{,}000}{\text{S\textdollar}24{,}000} = 2:1, \qquad \text{quick ratio} = \frac{\text{S\textdollar}48{,}000 - \text{S\textdollar}18{,}000}{\text{S\textdollar}24{,}000} = \frac{\text{S\textdollar}30{,}000}{\text{S\textdollar}24{,}000} = 1.25:1.

step 4: interpret

A $40\%$ gross margin and $15\%$ profit margin show the business keeps a healthy share of sales as profit after expenses. A current ratio of $2:1$ and a quick ratio of $1.25:1$ both exceed $1:1$ , so it can meet short-term debts even without selling inventory. Comparing these with the prior year or the industry would confirm whether performance is improving.

Financial statement analysis turns the statements into judgements in O-Level Principles of Accounts (SEAB/Cambridge 7087). Profitability ratios include the gross profit margin ( $\tfrac{\text{gross profit}}{\text{sales}} \times 100\%$ ), the profit margin and return on capital. Liquidity ratios are the current ratio ( $\tfrac{\text{current assets}}{\text{current liabilities}}$ ) and the stricter quick ratio, which excludes inventory. Efficiency ratios (inventory turnover and the receivables and payables periods) show how well inventory, customers and suppliers are managed. A ratio means little until interpreted against a prior period, another business or a benchmark, and ratio analysis has limits: historical data, ignored non-financial factors, differing policies and one-off events. The papers reward both the calculation and the interpretation.

Check your knowledge

A mix of recall and calculation questions across the module. Work each fully, then check against the solutions.

State the formula for the gross profit margin. (2 marks)
Gross profit is $\text{S\textdollar}25{,}000$ and sales are $\text{S\textdollar}100{,}000$ . Calculate the gross profit margin. (2 marks)
Current assets are $\text{S\textdollar}60{,}000$ and current liabilities are $\text{S\textdollar}30{,}000$ . Calculate the current ratio. (2 marks)
Current assets are $\text{S\textdollar}60{,}000$ (including inventory $\text{S\textdollar}24{,}000$ ) and current liabilities are $\text{S\textdollar}30{,}000$ . Calculate the quick ratio. (3 marks)
Explain what the quick ratio measures that the current ratio does not. (2 marks)
State two limitations of ratio analysis. (2 marks)

Solutions

Q1: Gross profit margin $= \dfrac{\text{gross profit}}{\text{sales}} \times 100\%$ .
Q2: Gross profit margin $= \dfrac{\text{S\textdollar}25{,}000}{\text{S\textdollar}100{,}000} \times 100\% = 25\%$ .
Q3: Current ratio $= \dfrac{\text{S\textdollar}60{,}000}{\text{S\textdollar}30{,}000} = 2$ , expressed as $2:1$ .
Q4: Quick ratio $= \dfrac{\text{S\textdollar}60{,}000 - \text{S\textdollar}24{,}000}{\text{S\textdollar}30{,}000} = \dfrac{\text{S\textdollar}36{,}000}{\text{S\textdollar}30{,}000} = 1.2$ , expressed as $1.2:1$ .
Q5: The quick ratio excludes inventory, the least liquid current asset, so it measures whether the business can pay its short-term debts without relying on selling its inventory, a stricter test than the current ratio.
Q6: Any two of: ratios use historical figures that may be out of date; they ignore non-financial factors; they can be distorted by different accounting policies, inflation or one-off events; a single ratio in isolation can mislead.

Sources & how we know this

Principles of Accounts (Syllabus 7087) — Singapore Examinations and Assessment Board (2026)
Singapore-Cambridge GCE Ordinary Level (joint SEAB and Cambridge examination) — Singapore Examinations and Assessment Board / Cambridge Assessment International Education (2026)