Question
The average cost of two chairs is Rs. 15000. The average
cost decrease by 30% when one more chair is included. What is the cost price of the 3 rd chair?Solution
Total cost of two chairs = 15000 × 2 = Rs. 30000 Average cost of all the three chairs = 15000 × (70/100) = Rs. 10500 Total cost of all the three chairs = 10500 × 3 = Rs. 31500 Cost of the 3rd chair = 31500 - 30000 = Rs. 1500
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