A sum of money place at compound interest doubles itself in 4 years. In how man

Question

A sum of money place at compound interest doubles itself in 4 years. In how many years will it amount to eight times itself?

Options:

A . 16

B . 8

C . 12

D . 20

Answer: Option C

100 ---- 200 ---- 4

400 ---- 4

800 ---- 4

------

12 years

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