A sum of money becomes 3 times in 10 years at the rate of compound interest (compounded annually). In how many years will it become 81 times?

A sum of money becomes 3 times in 10 years at the rate of compound int

1.	A sum of money becomes 3 times in 10 years at the rate of compound interest (compounded annually). In how many years will it become 81 times?
A.	40 years
B.	30 years
C.	35 years
D.	50 years
Answer» B. 30 years

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A sum of money becomes 3 times in 10 years at the rate of compound interest (compounded annually). In how many years will it become 81 times?

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