The average cost of three chairs is Rs.12000. The average cost decrease by 15% when one more chair is included. What is the cost price of the 4th chair?
Total cost of three chairs = 12000 × 3 = Rs. 36000 Average cost of all the four chairs = 12000 × (85/100) = Rs. 10200 Total cost of all the four chairs = 10200 × 4 = Rs. 40800 Cost of the 3rd chair = 40800 - 36000 = Rs. 4800
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