Question
The average cost of 3 chairs is Rs. 9500. The average
cost decrease by 15% when one more chair is included. What is the cost price of the 4th chair?Solution
Total cost of 3 chairs = 9500 × 3 = Rs. 28500 Average cost of all the 4 chairs = 9500 × (85/100) = Rs. 8075 Total cost of all the 4 chairs = 8075 × 4 = Rs. 32300 Cost of the 4th chair = 32300 - 28500 = Rs. 3800
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