A shopkeeper marks his goods 20% above his cost price and

A shopkeeper marks his goods 20% above his cost price and gives 15% discount on the marked price. His gain percent is

If the C.P. of goods be ₹ 100, then
Marked price = ₹ 120
discount = 15%

∴ S.P. =	120 × 85	= ₹ 102
	100

Profit = S.P. - C.P. = 102 - 100 = ₹ 2

Hence, Required percent =	2	× 100 = 2%
	100

Second method :
Here, r = 20%, r₁ = 15%
Using the given formula ,

Gain % =	r × (100 − r₁)	− r₁
	100

Gain % =	20 × (100 − 15)	− 15
	100

=	20 × 85	− 15
	100

Gain % = 17 – 15 = 2%