If Re.1 amounts to Rs.9 over a period of 20 years. What is the rate of simple interest? Choices.
A) 90%	B) 30%	C) 80%	D) 40%	E) 42%
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?