The compound interest on a certain sum for 2 years at 10 per annum is Rs 1155 The simple interest on......

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 ?

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

Hence, option 1 is the correct answer.

By: Amit Kumar