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    Question

    The average cost of three chairs is Rs.12000. The

    average cost decrease by 15% when one more chair is included. What is the cost price of the 4th chair?
    A Rs.4800 Correct Answer Incorrect Answer
    B Rs.3360 Correct Answer Incorrect Answer
    C Rs.3200 Correct Answer Incorrect Answer
    D Rs.5200 Correct Answer Incorrect Answer

    Solution

    Total cost of three chairs = 12000 × 3 = Rs. 36000 Average cost of all the four chairs = 12000 × (85/100) = Rs. 10200 Total cost of all the four chairs = 10200 × 4 = Rs. 40800 Cost of the 3rd chair = 40800 - 36000 = Rs. 4800

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