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    Question

    The average cost of three chairs is Rs.16000. The

    average cost decrease by 20% when one more chair is included. What is the cost price of the 4th chair?
    A Rs.4800 Correct Answer Incorrect Answer
    B Rs.2000 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 = 16000 × 3 = Rs. 48000 Average cost of all the four chairs = 16000 × (80/100) = Rs. 12800 Total cost of all the four chairs = 12800 × 4 = Rs. 51200 Cost of the 4rd chair = 51200 - 48000 = Rs. 3200

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