A man bought 30 defective machines for Rs. 1000. He repaired and sold them @ Rs. 300 per machine. He got profit of Rs. 150 per machine. How much did he spend on repairs ?(in Rupees)
Amount spent on buying 30 defective machines = Rs. 1000
Let amount spent on repairs = $$Rs.$$ $$100x$$
=> Total CP = $$Rs.$$ $$(100x+1000)$$
Selling price per machine = Rs. 300
=> Total SP = $$30 \times 300 = Rs.$$ $$9000$$
Profit per machine = Rs. 150
=> Total profit = $$30 \times 150=Rs.$$ $$4500$$
Also, Profit = SP - CP
=> $$4500-(100x+1000)=9000$$
=> $$100x+1000=9000-4500$$
=> $$100x+1000=4500$$
=> $$100x=4500-1000=3500$$
=> $$x=\frac{3500}{100}=35$$
$$\therefore$$ Amount spent on repairs = $$100 \times 35=Rs.$$ $$3500$$
=> Ans - (C)
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