Question
The average cost of four chairs is Rs.20000. 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 four chairs = 20000 × 4 = Rs. 80000 Average cost of all the five chairs = 20000 × (85/100) = Rs. 17000 Total cost of all the five chairs = 17000 × 5 = Rs. 85000 Cost of the 5th chair = 85000 - 80000 = Rs. 5000
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