A sum borrowed under compound interest doubles itself in 10 years. When will it become fourfold of itself at the same rate of interest?

A sum borrowed under compound interest doubles itself in 10 years. Whe

1.	A sum borrowed under compound interest doubles itself in 10 years. When will it become fourfold of itself at the same rate of interest?
A.	24 years
B.	15 years
C.	20 years
D.	40 years
Answer» D. 40 years

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A sum borrowed under compound interest doubles itself in 10 years. When will it become fourfold of itself at the same rate of interest?

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