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    Question

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

    cost decrease by 20% when one more chair is included. What is the cost price of the 3rd chair?
    A Rs.5200 Correct Answer Incorrect Answer
    B Rs.4000 Correct Answer Incorrect Answer
    C Rs.7500 Correct Answer Incorrect Answer
    D Rs.5000 Correct Answer Incorrect Answer

    Solution

    Total cost of two chairs = 10000 × 2 = Rs. 20000 Average cost of all the three chairs = 10000 × (80/100) = Rs. 8000 Total cost of all the three chairs = 8000 × 3 = Rs. 24000 Cost of the 3rd chair = 24000 - 20000 = Rs. 4000

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