In how many years will a sum of money doubles itself at 5% per annum on simple interest?	Choose the correct answer
A) 33  B) 20  C) 88  D) 66  E) 21
P = (P*5*R)/100   R = 20%   Answer: 20
<result>B</result>
In how many years will a sum of money doubles itself at 5% per annum on simple interest?