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The compound interest on a certain sum for 2 years at 10% per annum is Rs. 1155. The simple interest on the same sum for double the time at half the rate percent per annum is ?

Correct Answer: Rs. 1100

Explanation:

Let the sum be Rs.x. Then, 


 


  x 1 + 10 100 2 - x = 1155


 


x 11 10 2 - 1 = 1155


 


=> x =5500


 


sum = Rs. 5500.


 


So, S.I = Rs.  5500 × 5 × 4 100  = 1100


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