The difference between the selling prices of an article

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The difference between the selling prices of an article at a profit of 15% and at a profit of 10% is $ 10. The cost price of the article is

Let the CP of the article be y.
According to question ,

∴		115y	-	110y	= 10
		100		100

⇒	5y	= 10
	100

⇒ y =	10 × 100	= $ 200
	5