If rupee one produces rupees nine over a period of 40 years, find the rate of simple interest?	Select the correct option:
A) 22 1/2 %
B) 22%
C) 21 %
D) 30%
E) 40 %
9 = (1*40*R)/100   R = 22 1/2 %   22 1/2 %NSWER 22 1/2 %
<result>A</result>
If rupee one produces rupees nine over a period of 40 years, find the rate of simple interest?