An amount at compound interest sums to Rs.17640/- in 2 years and to Rs.22050/- in 3 years at the same rate of interest. Find the rate percentage?
Choose the correct choice: A) 5% B) 7% C) 9% D) 11% E) 25%
Explanation:   The difference of two successive amounts must be the simple interest in 1 year on the lower amount of money.   S.I = 22050/- - 17640/- = Rs. 4410/-   Rate of interest = (4410/17640) × (100/1) =&gt; 25%   Answer: Option 25%
<result>E</result>
An amount at compound interest sums to Rs.17640/- in 2 years and to Rs.22050/- in 3 years at the same rate of interest. Find the rate percentage?