In how much time, will a sum of money become double of itself at 15% per annum simple interest

In how much time, will a sum of money become double of itself at 15% per annum simple interest
1). $6\frac{1}{4}$ years
2). $6\frac{1}{2}$ years
3). $6\frac{1}{3}$ years
4). $6\frac{2}{3}$ years

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