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

    Question

    The average cost of 4 chairs is Rs. 10000. The average

    cost decrease by 15% when one more chair is included. What is the cost price of the 5th chair?
    A Rs.2500 Correct Answer Incorrect Answer
    B Rs.2360 Correct Answer Incorrect Answer
    C Rs.2800 Correct Answer Incorrect Answer
    D Rs.2000 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Total cost of 4 chairs = 10000×4 = Rs. 40000 Average cost of all the 5 chairs = 10000×(85/100) = Rs. 8500 Total cost of all the 5 chairs = 8500 ×5 = Rs. 42500 Cost of the 5thchair = 42500 - 40000 = Rs. 2500

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