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Question

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


A
Rs.120
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B
Rs.150
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C
Rs.1200
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D
Rs.1500
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Solution

The correct option is A $$Rs. 120$$
Let Cost price of $$1$$ book $$=x$$
Selling price of $$12$$ books $$=Rs.1800$$
Gain $$=3x$$
Selling price of $$12$$ book -Cost price of $$12$$ books = Gain 
$$1800-12x=3x$$
$$1800=12x+3x$$
$$1800=15x$$
$$x=120$$
$$\therefore$$ Cost of $$1$$ book $$=Rs\ 120$$

Mathematics

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