The C.I. on a certain sum for 2 years Rs.41 and the simple interest is Rs.40. What is the rate percent?  Choose the correct answer.
A) 3%  B) 5%  C) 6%  D) 2%  E) 7%
SI = 20 + 20   CI = 20 + 21   20 ---- 1   100 ---- ? =&gt; 5%   Answer:5%
<result>B</result>
The C.I. on a certain sum for 2 years Rs.41 and the simple interest is Rs.40. What is the rate percent?