If rupee one produces rupees nine over a period of 45 years, find the rate of simple interest?  Choices.
A) 22 1/7 % B) 22 3/2 % C) 22 1/8 % D) 20 % E) 22 1/2 %
9 = (1*45*R)/100   R = 20 %   Answer:20 %
<result>D</result>
If rupee one produces rupees nine over a period of 45 years, find the rate of simple interest?