At what rate of simple interest will a sum of money double itself in 18 years?

At what rate of simple interest will a sum of money double itself in 18 years?
1). \(5\frac{5}{9}{\rm{\% }}\)
2). \(5\frac{2}{3}{\rm{\% }}\)
3). \(5\frac{5}{2}{\rm{\% }}\)
4). 5%

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