In how many years will a sum of money doubles itself at 5% per annum on simple interest?
Choose the correct option:
A) 10 %
B) 5 %
C) 12 %
D) 16 %
E) 20%
20%xplanation:   P = (P*5*R)/100   R = 20%   Answer: 20%
<result>E</result>
In how many years will a sum of money doubles itself at 5% per annum on simple interest?