A sum of Rs. 12500 amounts to Rs. 16000 in 4 years at the rate of simple interest. What is the rate of interest?	Choose the correct answer.
A) 7%
B) 5%
C) 6%
D) 8%
E) 14%
S.I. = (16000 - 12500) = Rs. 3500/-   Rate = (100 * 3500) / (12500 * 4)= 
<gadget id="calculator">(100 * 3500) / (12500 * 4)</gadget>
<output>7</output>
7%   7%NSWER:7%
<result>A</result>
A sum of Rs. 12500 amounts to Rs. 16000 in 4 years at the rate of simple interest. What is the rate of interest?