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    Question

    The average cost price of 14 pens (having equal cost

    price) decreased by Rs.2, when one of the pen is replaced by a new pen having cost price of Rs.80. Find the cost price of the pen that was replaced.
    A Rs.120 Correct Answer Incorrect Answer
    B Rs.99 Correct Answer Incorrect Answer
    C Rs.118 Correct Answer Incorrect Answer
    D Rs.108 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Let the cost price of each pen be Rs.x So, cost price of 14 pens = Rs.14x According to the question, => (14x – x + 80)/14 = x – 2 => 13x + 80 = 14x – 28 => x = 108 Therefore, the cost price of the pen that was replaced is = Rs.108

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