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    Question

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

    average cost decrease by 12% 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
    E Rs.4100 Correct Answer Incorrect Answer

    Solution

    Total cost of three chairs = 10000 × 3 = Rs. 30000 Average cost of all the four chairs = 10000 × (88/100) = Rs. 8800 Total cost of all the four chairs = 8800 × 4 = Rs. 35200 Cost of the 3rd chair = 35200 - 30000 = Rs. 5200

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