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    The selling price of 20 books is equal to the cost price of 6 books. Find the loss or gain percentage.
    Question

    The selling price of 20 books is equal to the cost price of 6 books. Find the loss or gain percentage.

    A.

    70% gain

    B.

    507\frac{50}{7}% gain

    C.

    507\frac{50}{7}% loss​

    D.

    70% loss

    Correct option is D

    Given:

    20SP = 6CP

    Solution:

    20SP = 6CP

    SPCP=620\frac{SP}{CP} = \frac{6}{20}

    SP = 6 , CP = 20

    Loss = CP – SP = 20 – 6 = 14

    Loss % = LossCP×100=1420×100=14×5\frac{\text{Loss}}{CP}\times100 = \frac{14}{20}\times100 = 14\times5​ = 70%

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