0580/23 May/Jun 2023, Question 15: Compound Interest
Cambridge IGCSE Mathematics 0580 · Paper 23 (Extended) · Calculator · 2 marks
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The question, in short
Given exponential decay of 1.75% per year and 980 trees eleven years ago, calculate the present number of trees, rounded to the nearest integer.
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Solution · 2 marks
- 1980 × (1 − 1.75/100)¹¹
- 2= 980 × 0.9825¹¹
- 3= 807.01…
- 4≈ 807 trees
Answer807
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