compound interest

The compound interest on a certain sum for 2 years at 10% per annum is Rs. 525. The simple interest on the same sum for double the time at half the rate percent per annum is --------------------


Answer:

Let the sum be Rs. P.

Then,		P		1 +	10		2	- P		= 525
					100

	P			11		2	- 1		= 525
				10

P =		525 x 100		= 2500.
		21

 Sum = Rs . 2500.

So, S.I. = Rs.

2500 x 5 x 4

= Rs. 500

                               100