A certain sum of money becomes double of itself in 5 years at a rate of simple interest. In how many years will it become 16 times of itself at the same rate of simple interest?

A certain sum of money becomes double of itself in 5 years at a rate of simple interest. In how many years will it become 16 times of itself at the same rate of simple interest?
1). 20
2). 60
3). 75
4). No option is correct.

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