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      Question

      The average cost price of 18 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.74. Find the cost price of the pen that was replaced.
      A Rs.120 Correct Answer Incorrect Answer
      B Rs.110 Correct Answer Incorrect Answer
      C Rs.118 Correct Answer Incorrect Answer
      D Rs.100 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 18 pens = Rs.18x According to the question, => (18x – x + 74)/18 = x – 2 => 17x + 74 = 18x – 36 => x = 110 Therefore, the cost price of the pen that was replaced is = Rs.110

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