Question 46

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

Solution

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Let the cost of the 12 books be 12x

Selling price is 1800

So, profit = 1800 - 12x

But 1800 - 12 x = 3x

So, x = 1800/15 = 120 

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