The cost price of a copy is :

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

  1. Rs. 120
  2. Rs. 150
  3. Rs. 1200
  4. Rs. 1500
Anurag Mishra Professor Asked on 23rd January 2016 in Maths.
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1 Answer(s)

Answer:  (1) Rs. 120 

Explanation:-
Let the cost price of a book be Rs. X
Therefore, the cost price of 3 books = Rs. 3 X
And, the cost price of 12 books = Rs. 12 X

Selling price of 12 books = Rs. 1800
Then, 12 X + 3 X = 1800
 15 X = 1800
X = 1800/15
X = 120 

Then, the cost price of a book is Rs. 120. 

Hence, the correct answer is option (1) Rs. 120. 

Anurag Mishra Professor Answered on 23rd January 2016.
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