Question
The average cost of 3 chairs is Rs. 10000. The average
cost decrease by 22% when one more chair is included. What is the cost price of the 4th chair?Solution
Total cost of 3 chairs = 10000 × 3 = Rs. 30000 Average cost of all the 4 chairs = 10000 × (78/100) = Rs. 7800 Total cost of all the 4 chairs = 7800 × 4 = Rs. 31200 Cost of the 4th chair = 31200 - 30000 = Rs. 1200
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