Question
The average cost of three chairs is Rs.10000. The
average cost decrease by 10% when one more chair is included. What is the cost price of the 4th chair?Solution
Total cost of three chairs = 10000 × 3 = Rs. 30000 Average cost of all the four chairs = 10000 × (90/100) = Rs. 9000 Total cost of all the four chairs = 9000 × 4 = Rs. 36000 Cost of the 3rd chair = 36000 - 30000 = Rs. 6000
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