Ramesh sold a book at a loss of 30%. If he had sold it for

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Ramesh sold a book at a loss of 30%. If he had sold it for Rs. 140 more, he would have made a profit of 40%. The cost price of the book is

Let the C.P. of the book be Rs. y.

∴ S.P. of the book = Rs.	70y
	100

S.P. of the book = Rs.	7y
	10

Case II,

		140y	=	7y	+ 140
		100		10

⇒		14y	-	7y	= 140
		10		10

⇒	7y	= 140 ⇒ 7y = 1400
	10

⇒ y =	1400	= Rs. 200
	7