Question
The average cost of three chairs is Rs.12000. The
average cost decrease by 18% when one more chair is included. What is the cost price of the 4th chair?Solution
Total cost of three chairs = 12000 × 3 = Rs. 36000 Average cost of all the four chairs = 12000 × (82/100) = Rs. 9840 Total cost of all the four chairs = 9840 × 4 = Rs. 39360 Cost of the 3rd chair = 39360 - 36000 = Rs. 3360
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