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 answers: A) 22 1/7 % B) 22 8/2 % C) 22 1/9 % D) 22 1/2 % E) 22 2/2 %
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?