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
B
Rs.150
C
Rs.1200
D
Rs.1500

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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