A sum is invested at compounded interest payable annually. The interest in the first two successive years was Rs. 400 and Rs. 420. The sum is	Pick.
A) Rs. 8000
B) Rs. 8200
C) Rs.7500
D) Rs. 8500
E) Rs. 9000
Explanation:   his means that, simple Interest on Rs.400 for 1 year = 420 - 400= 
<gadget id="calculator">420 - 400</gadget>
<output>20</output>
20   Rate= (100 Ã—SI)/PT = (100 Ã— 20)/(400Ã—1) = 5%   Rs.400 is the interest on the sum for 1st year   Hence, sum = (100 Ã— SI)/RT = (100 Ã— 400)/(5 Ã— 1) = Rs. 8000   Rs. 8000NSWER IS Rs. 8000
<result>A</result>
A sum is invested at compounded interest payable annually. The interest in the first two successive years was Rs. 400 and Rs. 420. The sum is