A sum of money doubles itself in 5 years at simple interest. In how many years will it become 4 times itself?

Topic: Interest
Subtopic: Simple Interest

A10 years

B12 years

C15 years

D20 years

Explanation

If principal doubles, Interest = P in 5 years. For amount to become 4P, Interest required = 3P. Time taken = 3 * 5 = 15 years.

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