Question
The average cost of three chairs is Rs.11000. The
average cost decrease by 20% when one more chair is included. What is the cost price of the 4th chair?Solution
Total cost of three chairs = 11000 × 3 = Rs. 33000 Average cost of all the four chairs = 11000 × (80/100) = Rs. 8800 Total cost of all the four chairs = 8800 × 4 = Rs. 35200 Cost of the 3rd chair = 35200 - 33000 = Rs. 2200
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