0580/32 Oct/Nov 2025, Question 28: Compound Interest
Cambridge IGCSE Mathematics 0580 · Paper 32 (Core) · Calculator · 5 marks
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The question, in short
Compare Ali's $2950 at 12% compound interest with Bob's $3000 at 12% simple interest over 3 years, showing Ali ends with more.
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Solution · 5 marks
- 1Ali: 2950 × (1 + 12/100)³ = 2950 × 1.12³ = 4144.54…
- 2Bob interest: 3000 × 12 × 3 ÷ 100 = 1080
- 3Bob: 3000 + 1080 = 4080
- 44144.54… > 4080, so Ali has the larger investment
AnswerAli $4144.54…, Bob $4080
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