If rupee one produces rupees nine over a period of 40 years, find the rate of simple interest? Choose the correct choice from the following options:
A) 22 1/9 %  B) 22 2/2 %  C) 23 1/2 %  D) 22 1/2 %  E) 62 1/2 %
9 = (1*40*R)/100   R = 22 1/2 %   Answer:22 1/2 %
<result>D</result>
If rupee one produces rupees nine over a period of 40 years, find the rate of simple interest?