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Question

Oil equal to 25% of the weight of the groundnut is extracted in a mill. The matter left after extraction is sold as cattle feed at the rate of Rs. 12/Kg. If the groundnuts are bought at Rs. 20/Kg and the processing fee is Rs. 2.5/Kg, at what price (in Rs. /Kg) should the oil be sold to earn 30% profit on total costs?

A
Rs. 90
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B
Rs. 85
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C
Rs. 81
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D
Rs. 75
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Solution

The correct option is C Rs. 81
Let us assume he bought 100 Kg. of groundnuts
Total cost incurred =100×22.5=2250
Revenue from cattle feed =12×75=900
Revenue he should get from oil to get 30% profit =(2250×1.3)900=2025
Price per Kg. of oil should be =202525=Rs.81/Kg.
(PS - Use alligation to get the answer faster).

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