Oil, equal to 20% of the weight of groundnut, is extracted in a mill. The matter left after extraction is sold as cattle feed at the rate of Rs. 12.5/kg. The groundnuts are bought at Rs. 20/kg. The processing cost is Rs. 5/kg. At what price (Rs. per kg) should the oil be sold to earn 20% profit on total costs (Total cost = Cost of groundnuts and Processing costs)?
1). 250
2). 150
3). 200
4). 100

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