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    Question

    The average cost of three chairs is Rs.10000. The

    average cost decrease by 10% when one more chair is included. What is the cost price of the 4th chair?
    A Rs.4800 Correct Answer Incorrect Answer
    B Rs.6000 Correct Answer Incorrect Answer
    C Rs.3200 Correct Answer Incorrect Answer
    D Rs.5200 Correct Answer Incorrect Answer

    Solution

    Total cost of three chairs = 10000 × 3 = Rs. 30000 Average cost of all the four chairs = 10000 × (90/100) = Rs. 9000 Total cost of all the four chairs = 9000 × 4 = Rs. 36000 Cost of the 3rd chair = 36000 - 30000 = Rs. 6000

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