If Re.1 amounts to Rs.9 over a period of 20 years. What is the rate of simple interest?
Choose the correct answer:  A) 49%  B) 90%  C) 60%  D) 40%  E) 41%
8 = (1*20*R)/100   R = 40%   Answer:40%
<result>D</result>
If Re.1 amounts to Rs.9 over a period of 20 years. What is the rate of simple interest?