Arithmetichard · Past Paper
A sum of money double itself in 4 years at compound interest. In how many years will it become 8 times itself?
A8 years
B12 years
C16 years
D20 years
✓ Correct Answer: B — 12 years
2^1 times in 4 years. 8 = 2^3 times in 4 * 3 = 12 years.
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