Alligation rule application to Profit and Loss

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The cost of oil is Rs. 100 per kilogram. After adulteration with another oil, which costs Rs. 50 per kilogram, Ram sells the mixture at Rs. 96 per kilogram making a profit of 20%. In what ratio does he mix the two kinds of oil?
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Alligation rule says, Cost price of unit quantity of cheaper should be on the left of the diagram. Why did you take it on the right of the diagram?

romabhalerao