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    Question

    The average cost of 3 chairs is Rs. 8000. The average

    cost decrease by 20% when one more chair is included. What is the cost price of the 4th chair?
    A Rs.1600 Correct Answer Incorrect Answer
    B Rs.1360 Correct Answer Incorrect Answer
    C Rs.1450 Correct Answer Incorrect Answer
    D Rs.1200 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Total cost of 3 chairs = 8000 × 3 = Rs. 24000 Average cost of all the 4 chairs = 8000 × (80/100) = Rs. 6400 Total cost of all the 4 chairs = 6400 × 4 = Rs. 25600 Cost of the 4th chair = 25600 - 24000 = Rs. 1600

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