Interest Q.17

17Nagarjuna invested some money at compound rate of interest. His amount gets doubled in 9 years. In how many years will the amount become four times itself?

Option : D
Explanation : Let amount be Rs ‘A’
It becomes double = 2A in 9 years.
In next 9 years it again double i.e., becomes 2 × 2A = 4A
So in 9 + 9 = 18 years the amount becomes four times itself.

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