The compound interest on a certain sum of money invested

The compound interest on a certain sum of money invested for 2 years at 5% per annum is ₹ 328. The simple interest on the sum, at the same rate and for the same period will be

Given that , Compound Interest ( CI ) = ₹ 328 , Rate ( R ) = 5% , Time = 2 years
Let the principal be P.

∴ C.I. = P			1 +	R		^T	− 1
				100

⇒ 328 = P			1 +	5		²	− 1
				100

⇒ 328 = P		441	− 1
		400

⇒ 328 = P		441 − 400
		400

⇒ P =	328 × 400	= ₹ 3200
	41

∴ S.I. =	PRT	=	3200 × 5 × 2	= ₹ 320
	100		100

Second Method to solve this question :
Here, C.I. = ₹ 328 , R = 5% , S.I. = ?

C.I.= S.I.		1 +	R
			200

328 = S.I.		1 +	5
			200

328 = S.I.		1 +	1
			40

S.I. =	328 × 40
	41

S.I. = 8 x 40 = ₹ 320