A shopkeeper sells an article at 15% gain. Had he sold it

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A shopkeeper sells an article at 15% gain. Had he sold it for $ 18 more, he would have gained 18%. The cost price (in $) of the article is

Suppose C.P. of article be $ y
∴ (118 – 115)% of y = 18

⇒	y × 3	= 18
	100

⇒ y =	18 × 100	= $ 600
	3

We can find required answer with the help of given formula :
Here, a = 15%, R = 18, b = 18%

C.P. =	R × 100
	b - a

C.P. =	18 × 100	= $ 600
	18 - 15