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Q:

The price of the book is marked 20% above the C.P. If the market price of the book is Rs. 180, then what is the cost of the paper used in a single copy of the books?

  • 1
    Rs. 36
  • 2
    Rs. 37.50
  • 3
    Rs. 42
  • 4
    Rs. 44.25
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Answer : 2. "Rs. 37.50"
Explanation :

Clearly, marked price of the book = 120% of C.P
Also, cost of paper = 25% of C.P.
Let the cost of paper for a single book be Rs. n.
Then, 120 : 25 = 180 : n ⇒ n = Rs.  = Rs. 37.50

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