An article is sold at a loss of 10%. Had it been sold for

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An article is sold at a loss of 10%. Had it been sold for $ 90 more, there would have been a gain of 5%. The original sale price of the article (in $) is :

If the C.P. of article be $ y , then
According to question ,

		105y	-	90y	= 90
		100		100

⇒		15y	= 90 ⇒ y =	90 × 100	= 90
		100		15

y = $ 600

∴ Original S.P. =	600 × 90	= $ 540
	100