In how many years will a sum of money doubles itself at 30% per annum on simple interest?  Pick:
A) 7%	B) 3%	C) 5%	D) 8%	E) 2%
P = (P*30*R)/100   R = 3%   Answer:3%
<result>B</result>
In how many years will a sum of money doubles itself at 30% per annum on simple interest?