A sum of money becomes double in 3years at compound Interest compounded annually. At the same rate, in how many years will it become four times of itself

A sum of money becomes double in 3years at compound Interest compounded annually. At the same rate, in how many years will it become four times of itself
1). 4 years
2). 6 years
3). 6.4 years
4). 7.5 years

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