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      Question

      The average cost of four chairs is Rs.20000. The average

      cost decrease by 15% when one more chair is included. What is the cost price of the 5th chair?
      A Rs.5200 Correct Answer Incorrect Answer
      B Rs.4400 Correct Answer Incorrect Answer
      C Rs.7500 Correct Answer Incorrect Answer
      D Rs.5000 Correct Answer Incorrect Answer
      E Rs.6450 Correct Answer Incorrect Answer

      Solution

      Total cost of four chairs = 20000 × 4 = Rs. 80000 Average cost of all the five chairs = 20000 × (85/100) = Rs. 17000 Total cost of all the five chairs = 17000 × 5 = Rs. 85000 Cost of the 5th chair = 85000 - 80000 = Rs. 5000

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