0580/42 Oct/Nov 2025, Question 4: Direct Proportion in Real Life
Cambridge IGCSE Mathematics 0580 · Paper 42 (Extended) · Calculator · 4 marks
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The question, in short
Pedro makes cards at 9 cards per 20 minutes and each costs 12 cents, sold for 50 cents. Find cards made in 8 hours and percentage profit per card.
Summarised in our own words. Use the official paper for the exact wording and any diagrams.
Part (a) · 2 marks
Work out how many cards Pedro makes in 8 hours at 9 cards every 20 minutes.
- 18 hours = 8 × 60 = 480 minutes
- 2480 ÷ 20 = 24 lots of 20 minutes
- 324 × 9 = 216 cards
Answer216
Part (b) · 2 marks
Work out the percentage profit on each card costing 12 cents and sold for 50 cents.
- 1Profit = 50 − 12 = 38 cents
- 2Percentage profit = 38/12 × 100 = 316.66… ≈ 317%
Answer317 or 316.6 to 316.7
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