The difference between the simple and compound interest

The difference between the simple and compound interest on a certain sum of money for 2 years at 4% per annum is ₹ 4. The sum is

Here , Difference = C.I. - S.I. = ₹ 4 , Time = 2 years , Rate = 4%
Using the given formula ,

Sum = Difference		100		²
		r

Required Sum= 4 ×		100		²	= ₹ 2500
		4