A sum of money at compound interest amounts to thrice of itself in 3 years. In h

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A sum of money at compound interest amounts to thrice of itself in 3 years. In how many years it will be 9 times of itself?

Options:

A . 9 years

B . 27 years

C . 6 years

D . 3 years

Answer: Option C
x becomes 3x in 3 years
Therefore 3x also becomes 9x in 3 years
Required years = 3 + 3 = 6

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