Question
The average cost of 4 chairs is Rs. 15000. The average
cost decrease by 15% when one more chair is included. What is the cost price of the 5th chair?Solution
Total cost of 4 chairs = 15000 × 4 = Rs. 60000 Average cost of all the 5 chairs = 15000 × (85/100) = Rs. 12750 Total cost of all the 5 chairs = 12750 × 5 = Rs. 63750 Cost of the 5th chair = 63750 - 60000 = Rs. 3750
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