Question
A vendor sold 25 laptops at a profit of 12% and 15
laptops at a profit of 20%. If he had sold all the 40 laptops at a profit of 18%, his profit would have increased by ₹30,000. What is the cost price of each laptop, if the cost price of all the 40 laptops is the same?Solution
ATQ, Let the cost price of each laptop be C. Profit from 25 laptops at 12%: 3C Profit from 15 laptops at 20%: 3C Total original profit: 6C If sold all at 18%, profit = 7.2C. Increase in profit = ₹30,000: 
Thus, the cost price of each laptop is ₹25,000.
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