If a certain sum of money doubles itself in 7 years 8 months at simple interest, then what will be the yearly rate of interest (in %)?

If a certain sum of money doubles itself in 7 years 8 months at simple interest, then what will be the yearly rate of interest (in %)?
1). \(18\frac{3}{{24}}\)
2). \(13\frac{1}{{23}}\)
3). \(26\frac{2}{{23}}\)
4). 30

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