A trader marks his goods 45 % above the cost price and gives

A trader marks his goods 45 % above the cost price and gives a discount of 20 % on the marked price. The gain % on goods he makes is :

Let the C.P. of article be ₹ 100
⇒ Marked price = ₹ 145

⇒ S.P. =	145 × 80	= ₹ 116
	100

⇒ Profit percent = 16%
2nd method to solve this question.
Here, r = 45%, r₁ = 20%

Gain % =	r × (100 − r₁)	− r₁
	100

Gain % =	45 × (100 − 20)	− 20
	100

Gain % =	3600	− 20
	100

Required Gain % = 36 – 20 = 16%