A sum of money placed at compound interest double itself at 2 years

A sum of money placed at compound interest double itself at 2 years. The year it will take to amount 4 times itself is
(a) 6
(b) 4
(c) 8
(d) 3

Anurag Mishra Professor Asked on 21st March 2016 in Maths.
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    Answer: (b) 4 

    Anurag Mishra Professor Answered on 9th May 2016.
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