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    Question

    The average cost price of 25 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.40. Find the cost price of the pen that was replaced.
    A Rs.120 Correct Answer Incorrect Answer
    B Rs.90 Correct Answer Incorrect Answer
    C Rs.118 Correct Answer Incorrect Answer
    D Rs.104 Correct Answer Incorrect Answer

    Solution

    Let the cost price of each pen be Rs.x So, cost price of 25 pens = Rs.25x According to the question, => (25x – x + 40)/25 = x – 2 => 24x + 40 = 25x – 50 => x = 90 Therefore, the cost price of the pen that was replaced is = Rs.90

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