If a sum of money doubles itself in 8 years at simple interest, the ratepercent per annum is Choose the correct choice from the following options
A) 12 B) 12.5 C) 13 D) 13.5 E) 14
Explanation:   Let sum = x then Simple Interest = x   Rate = (100 * x) / (x * 8) = 12.5   Option 12.5
<result>B</result>
If a sum of money doubles itself in 8 years at simple interest, the ratepercent per annum is