Question
The average cost of three chairs is Rs.10000. The
average cost decrease by 12% 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 × (88/100) = Rs. 8800 Total cost of all the four chairs = 8800 × 4 = Rs. 35200 Cost of the 3rd chair = 35200 - 30000 = Rs. 5200
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60% of 3840 +? + 30% of 4380 = 40% of 8340 + 10% of 3480
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