1. 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)
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By: anil on 05 May 2019 01.49 am
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 = $$30 imes 300 = Rs.$$ $$9000$$ Profit per machine = Rs. 150 => Total profit = $$30 imes 150=Rs.$$ $$4500$$ Also, Profit = SP - CP => $$4500-(100x+1000)=9000$$ => $$100x+1000=9000-4500$$ => $$100x+1000=4500$$ => $$100x=4500-1000=3500$$ => $$x=frac{3500}{100}=35$$ $$ herefore$$ Amount spent on repairs = $$100 imes 35=Rs.$$ $$3500$$ => Ans - (C)
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