A shopkeeper allows a discount of 10% on the marked price

A shopkeeper allows a discount of 10% on the marked price of a camera. Marked price of the camera, which costs him ₹ 600, to make a profit of 20% should be

Let the marked price of the camera be Rs. m.
According to the question,

m × 90	=	600 × 120
100	=	100

⇒ m × 90 = 600 × 120

⇒ m =	600 × 120	= Rs. 800
	90

2nd method to solve this question.
Here, r = 20%
D = 10%
C.P. = Rs. 600
M.P. = ?

M.P.	=	100 + r
C.P.	=	100 − D

M.P.	=	100 + 20
600	=	100 − 10

M.P. =	120 × 600	= 800
	90