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A sum of money doubles itself in 10 years; in how many years will it treble itself at the same rate?

A.	30 years	B.	10 years
C.	20 years	D.	15 years

Answer and Explanation

Answer:20 years

Explanation:
Let the sum of money be Rs x and the rate of interest be r%
x + x(r)(10/100) = 2x
r = 10%
Let the period be n years
x + x(10)(n/100) = 3x
n = 20 years

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