New Enroll in RBI Grade B New Batch - Starts on May 21

    Question

    The average cost of 3 chairs is Rs. 10000. The average

    cost decrease by 22% when one more chair is included. What is the cost price of the 4th chair?
    A Rs.1000 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

    Solution

    Total cost of 3 chairs = 10000 × 3 = Rs. 30000 Average cost of all the 4 chairs = 10000 × (78/100) = Rs. 7800 Total cost of all the 4 chairs = 7800 × 4 = Rs. 31200 Cost of the 4th chair = 31200 - 30000 = Rs. 1200

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