Question: A sum of money doubles itself at a compound interest in 15 years . In how may years it will become 8 times ??\nOptions:\n(A) 30 years\n(B) 40 years\n(C) 45 years\n(D) 50 years\n(E) 60 years Let's think first. Some random reasoning:
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If the sum doubles (x2) in 15 years, then it to become 2*2*2 = 8 times as large it should double three times, so three 15 years time period are needed, which is 3*15 = 45 years. The final answer: (C).
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