On compound interest, a sum gets tripled to the original amount in 4 years. In how many years will it be 729 times its original amount?

On compound interest, a sum gets tripled to the original amount in 4 y

1.	On compound interest, a sum gets tripled to the original amount in 4 years. In how many years will it be 729 times its original amount?
A.	23
B.	24
C.	21
D.	22
Answer» C. 21

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On compound interest, a sum gets tripled to the original amount in 4 years. In how many years will it be 729 times its original amount?

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