Question : A man bought 30 defective machines for INR 1,000. He repaired and sold them at a rate of INR 300 per machine. He made a profit of INR 150 per machine. How much did he spend on repairs?
Option 1: INR 5,500
Option 2: INR 4,500
Option 3: INR 3,500
Option 4: INR 2,500
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Correct Answer: INR 3,500
Solution : The cost price of 30 defective machines = INR 1,000 The selling price of 1 machine = INR 300 Total selling price = INR 300 × 30 = INR 9,000 Profit per machine = INR 150 Total profit = INR 150 × 30 = INR 4,500 Repair cost = selling price – profit – cost price. = 9,000 – 4,500 – 1,000 = INR 3,500 Hence, the correct answer is INR 3,500.
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