What will be Cost Price of Copy? If

12 copies of a book were sold for Rs.1800 there by gaining cost price of 3 copies. Then the cost price of a copy is

  1. Rs.120
  2. Rs.150
  3. Rs.1,200
  4. Rs.1,500
Monis Rasool Professor Asked on 23rd May 2015 in Maths.
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1 Answer(s)

Answer: (a) Rs. 120
Explanation:-
Let be the cost price of 1 copy = Rs. X
Cost price of 3 copies =Rs. 3X
Cost price of 12 copies =Rs. 12X
Selling price of 12 copies =Rs. 1800
12X + 3X = 1800
15X = 1800
X = 1800/15
X = 120

Anurag Mishra Professor Answered on 23rd May 2015.
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