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    Question

    If the cost price of 9 pens is equal to the selling

    price of 11 pens, then what is gain or loss percentage?
    A 22% Correct Answer Incorrect Answer
    B 25% Correct Answer Incorrect Answer
    C 18.2% Correct Answer Incorrect Answer
    D 16% Correct Answer Incorrect Answer

    Solution

    Let the Cost Price (CP) of 1 pen = ₹1

    Then, CP of 9 pens = ₹9

    Given: SP of 11 pens = ₹9

    So, SP of 1 pen = ₹9 ÷ 11 = ₹9/11

    CP of 1 pen = ₹1

    SP of 1 pen = ₹9/11 ≈ ₹0.818

    Loss = CP – SP = 1 – 9/11 = 2/ 11 ​

    Loss % = (2/11) × 100 = 18.18%

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