When an article is sold at a gain of 20%, it yields $ 60

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When an article is sold at a gain of 20%, it yields $ 60 more than when it is sold at a loss of 20%. The cost price of the article is

Let the CP of the article be $ y

∴		120y	-	80y	= 60
		100		100

⇒ 40y = 60 × 100

⇒ y =	60 × 100	= $ 150
	40

We can find required answer with the help of given formula :
Here, a = 20%, R = $ 60, b= 20%

C.P. =	R × 100
	b + a

C.P. =	60 × 100
	20 + 20

C.P. =	6000	= $ 150
	40