If a sum of money doubles itself in 5 years at simple interest, the ratepercent per annum is  Choose the correct option:	A) 12	B) 12.5	C) 20	D) 13.5	E) 14
Explanation:   Let sum = x then Simple Interest = x   Rate = (100 * x) / (x * 5) = 20   Option 20
<result>C</result>
If a sum of money doubles itself in 5 years at simple interest, the ratepercent per annum is