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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 3 rd chair?
    A Rs.1200 Correct Answer Incorrect Answer
    B Rs.2200 Correct Answer Incorrect Answer
    C Rs.1800 Correct Answer Incorrect Answer
    D Rs.1500 Correct Answer Incorrect Answer
    E Rs.1600 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 3rdchair = 31500 - 30000 = Rs. 1500

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