A shopkeeper fixes the price of an article at 30% higher

A shopkeeper fixes the price of an article at 30% higher than its actual cost. If the sells it at 10% discount on marked price then, the profit is :

Let the C.P. of article be Rs. 100.
∴ Marked price = Rs. 130

S.P. =	130 × 90	= Rs. 117
	100

∴ Profit% = 17%
OR

Required profit percent =		x + y +	xy		%
			100

=		30 − 10 −	30 × 10		% = 17%
			100

Second Method :
Here, r = 30%
r₁ = 10%

Profit % =	r × (100 − r₁)	− r₁
	100

=	30 × (100 − 10)	− 10
	100

=	30 × 90	− 10 = 17%
	100