A sum doubles in 4 years at a certain rate of compound interest. In how many years does it amount to 8 times itself at the same rate?

A sum doubles in 4 years at a certain rate of compound interest. In ho

1.	A sum doubles in 4 years at a certain rate of compound interest. In how many years does it amount to 8 times itself at the same rate?
A.	12
B.	15
C.	6
D.	9
Answer» B. 15

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A sum doubles in 4 years at a certain rate of compound interest. In how many years does it amount to 8 times itself at the same rate?

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