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Question

The price of the book is marked 20% above the C.P. If the marked price of the book is Rs. 180, then what is the cost of the paper used in a single copy of the book?
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A
Rs. 36
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B
Rs. 37.50
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C
Rs. 42
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D
Rs. 44.25
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Solution

The correct option is A Rs. 37.50
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, $$120 : 25 = 180 : n \Rightarrow =\left(\frac{25\times 180}{120}\right)=Rs. 37.50$$

Mathematics

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