A businessman allows a discount of 10 % on the marked price.

A businessman allows a discount of 10 % on the marked price. What percent above the cost price must he mark his goods to make a profit of 17 percent ?

Let C.P. of article = ₹ 100
and marked price of article = ₹ p

∴ p ×	90	= 117
	100

⇒ p =	117 × 100	= ₹ 130
	90

i.e. 30% above the cost price.
2nd method to solve this question.
Let, C.P. = ₹ 100, r = 17%, D = 10%, M.P. = ?

M.P.	=	100 + r
C.P.	=	100 − r

M.P.	=	100 + 17
100	=	100 − 10

M.P. =	117	× 100
	90

⇒ 30% above cost price.