In how many years will a sum of money doubles itself at 5% per annum on simple interest?	Select
A) 20	B) 25	C) 15	D) 10	E) 30
P = (P*5*R)/100   R = 20%   20NSWER 20
<result>A</result>
In how many years will a sum of money doubles itself at 5% per annum on simple interest?