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      Question

      The average cost of two chairs is Rs. 15000. The

      average cost decrease by 30% when one more chair is included. What is the cost price of the 3rd chair? Section 5
      A Rs.3200 Correct Answer Incorrect Answer
      B Rs.2400 Correct Answer Incorrect Answer
      C Rs.1500 Correct Answer Incorrect Answer
      D Rs.1000 Correct Answer Incorrect Answer
      E Rs.1450 Correct Answer Incorrect Answer

      Solution

      Total cost of two chairs = 15000 × 2 = Rs. 30000 Average cost of all the three chairs = 15000 × (70/100) = Rs. 10500 Total cost of all the three chairs = 10500 × 3 = Rs. 31500 Cost of the 3rd chair = 31500 - 30000 = Rs. 1500

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