Exams › SSC CGL (Prelims) › Maths

A sum invested at compound interest becomes double in 5 years. At the same rate, in how many years will it grow to eight times the original sum?

1. 10 years
2. 15 years
3. 7 years
4. 20 years

Correct answer: 15 years

Solution

Money doubles every 5 years. Since 8 = 2³, the amount must double three times, taking 3 x 5 = 15 years.

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