A shopkeeper sells his goods at 10% discount on the marked

A shopkeeper sells his goods at 10% discount on the marked price. What price should he mark on an article that costs him ₹ 900 to gain 10% ?

Given that , C.P. of article = ₹ 900
Gain = 10%

∴ S.P. = ₹		110	× 900		= ₹ 990
		100

discount = 10%
Let the marked price be y.

∴	90	y = 990
	100

∴ y =	990 × 100	= ₹ 1100
	90

Second method to solve this question :
Here, D = 10%, C.P. = ₹ 900, R = 10%, M.P. = ?
Using the given formula ,

M.P.	=	100 + r
C.P.	=	100 − D

M.P.	=	100 + 10
900	=	100 − 10

M.P. =	110	× 900
	90

M.P. = ₹ 1100