Question
Rohit sold 20 watches at a profit of 30%. If he had sold
the watches for Rs. 2400 more in total, his overall profit would have been 50%. What is the selling price of 15 watches at 20% profit?Solution
 Let the cost price of each watch be Rs. y.  Initial selling price of all the watches = 1.3 × 20 × y = Rs. 26y  According to the question, 26y + 2400 = 1.5 × 20y Or, 30y - 26y = 2400 Or, 4y = 2400 Or, y = 600  Therefore, the selling price of 15 watches at 20% profit = 15 × 1.2y = Rs. 10800
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