A sum of Rs. 12,500 amounts to Rs. 15,500 in 4 years at the rate of simple interest. what is the rate of interest ?  Choose the correct choice from the following options.
A) 3 %  B) 4 %  C) 5 %  D) 6 %  E) 7 %
Solution   S.I= Rs.(15500-12500) =Rs.3000   Rate=(100*3000/12500*4)% =6%   Answer 6 %
<result>D</result>
A sum of Rs. 12,500 amounts to Rs. 15,500 in 4 years at the rate of simple interest. what is the rate of interest ?