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A man bought 30 defective machines for Rs. 1000. He repaired and sold them at the rate of Rs. 300 per machine. He got profit of Rs. 150 per machine. How much did he spend on repairs? (in Rupees)
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- 5500
- 4500
- 3500
- 2500
Correct Option: C
Given that , C.P. of 30 defective machines = Rs. 1000.
Let total expenditure on repairing be Rs. y.
∴ Actual C.P. = Rs. (1000 + y)
S.P. of 1 defective machine = Rs. 300
∴ Total S.P. of 30 defective machines = Rs. (300 × 30) = Rs. 9000
Total profit = Rs. (150 × 30) = Rs. 4500
∴ 9000 – (1000 + y) = 4500
⇒ 1000 + y = 9000 – 4500 = 4500
⇒ y = 4500 – 1000 = Rs. 3500
