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    Question

    The average cost of three chairs is Rs.15000. The

    average cost decrease by 15% when one more chair is included. What is the cost price of the 4th chair? Section 5
    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
    E Rs.6000 Correct Answer Incorrect Answer

    Solution

    Total cost of three chairs = 15000 × 3 = Rs. 45000 Average cost of all the four chairs = 15000 × (85/100) = Rs. 12750 Total cost of all the four chairs = 12750 × 4 = Rs. 51000 Cost of the 3rd chair = 51000 - 45000 = Rs. 6000

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