In how many years will a sum of money doubles itself at 5% per annum on simple interest? Choices
A) 80% B) 20% C) 29% D) 30% E) 60%
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?