12 copies of a book were sold for Rs. 1800 thereby gaining

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12 copies of a book were sold for Rs. 1800 thereby gaining cost price of 3 copies. The cost price of a copy of the book is :

Let the C.P. of each book be Rs. y.
According to the question ,
S.P. of 12 copies = Rs. (12y + 3y) = Rs. 15y
∴ 15y = 1800

⇒ y =	1800	= Rs. 120
	15