A sum becomes its double in 5 years on simple interest. What is the rate of interest?

5% 10% 15% 20%

20%

Let the principal = 100 It got doubled in 5 years means = 100 -------------- 200 200 - 100 = 100 Interest in 5 years. So, the rate would be = \(\frac{100}{5}\) = 20%