Growth & decay (compound interest)
Edexcel GCSE Maths revision on Growth & decay (compound interest). Aligned to the Pearson Edexcel GCSE Mathematics 1MA1 specification. This bank has 16 practice questions on this topic.
Sample questions (3 of 16)
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Question 1
100 pounds invested at 10% simple interest per year. Interest after 3 years?
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Answer: 30
Simple interest = principal x rate x time = 100 x 0.10 x 3 = 30 pounds.
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Question 2
1000 pounds at 5% compound interest, annually. Value after 2 years?
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Answer: 1102.5
Compound interest: multiply by (1 + rate) each year. 1000 x 1.05 = 1050. 1050 x 1.05 = 1102.50.
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Question 3
A car worth 20,000 depreciates 15% per year. Value after 1 year?
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Answer: 17000
Depreciation 15% per year. Keep 85% (0.85). 20,000 x 0.85 = 17,000.
Want to test yourself on the remaining cards for this topic?
13 more questions on Growth & decay (compound interest) — plus mistakes tracking and spaced repetition across the whole Maths spec.