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Question

A sum of money placed at compound interest doubles itself in 4 years. It will amount to eight times itself at the same rate in
  1. 9 years
  2. 10 years
  3. 12 years
  4. 14 years

A
14 years
B
9 years
C
10 years
D
12 years
Solution
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Re 1 becomes Rs 2 in 4 years
Rs 2 becomes Rs 4 in another 4 years
Rs 4 becomes Rs 8 in another 4 years
Re 1 becomes Rs 8 in (4 + 4 + 4) i.e., 12 years.

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