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  1. 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?

    2. A.

    Rs. 36
    B.

    Rs. 37.50
    C.

    Rs. 42
    D.

    Rs. 44.25

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    Answer : Option B

    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. [ \(\frac { 25 *180 } { 120 } \) ] = Rs. 37.50

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