If Re.1 amounts to Rs.9 over a period of 20 years. What is the rate of simple interest?
Select.
A) 26 2/3 %	B) 30 %	C) 27 1/2%	D) 40 %	E) 50 %
Explanation:   8 = (1*20*R)/100   R = 40%   ANSWER IS 40 %
<result>D</result>
If Re.1 amounts to Rs.9 over a period of 20 years. What is the rate of simple interest?