When profit changes, a good answer does three things. Measure the change with margins. Locate the line that moved most.
Support each possible cause with evidence, or say what evidence is missing. Restating “profit went from RM12,000 to RM11,000” is only the first step.
This lesson follows calculating liquidity in ratios and interpretation, and uses the margin ideas from margin versus markup.
How do you structure the interpretation?
- Calculate gross margin and profit margin for each year, as percentages of revenue.
- Calculate expenses as a percentage of revenue.
- Find which margin moved most.
- Suggest causes that fit that movement, using the words “may be because”.
- Name the extra evidence that would confirm the cause.
Remember that profit is not cash. A profit figure includes credit sales and accruals, so the cash versus profit bridge is a useful companion when a question mentions cash.
Worked example
Lestari Café, a fictional business, reported the following.
| Year 1 (RM) | Year 2 (RM) | |
|---|---|---|
| Revenue | 80,000 | 100,000 |
| Cost of sales | 48,000 | 65,000 |
| Gross profit | 32,000 | 35,000 |
| Expenses | 20,000 | 24,000 |
| Profit for the year | 12,000 | 11,000 |
Check: 80,000 − 48,000 = 32,000 and 32,000 − 20,000 = 12,000. Then 100,000 − 65,000 = 35,000 and 35,000 − 24,000 = 11,000.
Step 1, margins. Gross margin: Year 1 = 32,000 ÷ 80,000 = 40%; Year 2 = 35,000 ÷ 100,000 = 35%. Profit margin: Year 1 = 12,000 ÷ 80,000 = 15%; Year 2 = 11,000 ÷ 100,000 = 11%.
Step 2, expenses as % of revenue. Year 1 = 20,000 ÷ 80,000 = 25%. Year 2 = 24,000 ÷ 100,000 = 24%.
Step 3, locate the movement. Profit margin fell 4 percentage points (15% to 11%). Gross margin fell 5 points, while the expenses ratio improved by 1 point. So −5 + 1 = −4 matches. The main cause is at gross profit level.
Step 4, interpret with care. Revenue rose by 25% (100,000 ÷ 80,000 = 1.25), yet profit fell by about 8% (11,000 ÷ 12,000 = 0.917). Cost of sales grew faster than revenue. This may be because supplier prices rose, because discounts were used to attract sales, or because the sales mix moved to lower-margin items.
Step 5, name the evidence. Supplier invoices, the price list and discount records, and a sales breakdown by item would show which explanation is correct. Without them, the cause stays a possibility.
The mistake to watch for
Mistaken answer: “Profit fell because expenses went up from RM20,000 to RM24,000.”
The student compared amounts only. Expenses did rise in ringgit, but they fell as a share of revenue, from 25% to 24%.
The correction is to compare each line with revenue before naming a cause. Here the real pressure came from cost of sales, which rose from 60% of revenue to 65%. Check: 48,000 ÷ 80,000 = 60% and 65,000 ÷ 100,000 = 65%.
Check yourself
1. Year A: revenue RM60,000, profit RM9,000. Year B: revenue RM75,000, profit RM9,000. Find the profit margins and describe the change.
Show answer
Year A: 9,000 ÷ 60,000 = 15%. Year B: 9,000 ÷ 75,000 = 12%. Revenue rose by 25% but profit stayed the same, so the margin fell by 3 percentage points. Costs absorbed all the extra revenue.
2. Gross profit was RM24,000 on revenue of RM60,000 in Year A, and RM27,000 on RM75,000 in Year B. What happened to gross margin?
Show answer
Year A: 24,000 ÷ 60,000 = 40%. Year B: 27,000 ÷ 75,000 = 36%. Gross margin fell by 4 percentage points, even though gross profit rose in amount.
3. Name two pieces of evidence that would help you decide why the gross margin in question 2 fell.
Show answer
Examples: supplier price lists for both years, to see whether purchase costs rose; and records of discounts or promotions, to see whether selling prices were cut. A breakdown of sales by product would also help.
Where this leads next
Next, see how to compare firms only with relevant context. The percentage-base explorer helps check percentage changes, and the ratios practice set mixes these skills.
If your written comments tend to stop at the numbers, a teacher in our online one-to-one Accounting tuition can help you practise turning each figure into a reasoned sentence.