If Re.1 amounts to Rs.9 over a period of 10 years. What is the rate of simple interest?  Choose one:
A) 90%	B) 30%	C) 50%	D) 80%	E) 70%
8 = (1*10*R)/100   R = 80%   ANSWER:80%
<result>D</result>
If Re.1 amounts to Rs.9 over a period of 10 years. What is the rate of simple interest?