At the rate of any compound interest rate, a sum doubles itself in 3 years, then in how many years it will be 128 times of its own?

At the rate of any compound interest rate, a sum doubles itself in 3 y

1.	At the rate of any compound interest rate, a sum doubles itself in 3 years, then in how many years it will be 128 times of its own?
A.	25 Years
B.	23 years
C.	21 Years
D.	19 Years
Answer» D. 19 Years

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At the rate of any compound interest rate, a sum doubles itself in 3 years, then in how many years it will be 128 times of its own?

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