A small firm manufactures and sells litre cartons of non-alcoholic cocktails, X and
Y, which sell for $1 and $1.25, respectively. Each is made by mixing fresh orange, pineapple, and apple juices in different proportions. X consists of one part orange, six parts pineapple and one part apple. Y consists of two parts orange, three parts pineapple and one part apple. The firm can buy up to 300 litres of orange juice, up to 1125 litres of pineapple juice and up to 195 litres of apple juice each week at a cost of $0.72, $0.64 and $0.48 per litre, respectively. Find the number of cartons of X and Y that the firm should produce to maximise profits. You may assume that non-alcoholic cocktails are so popular that the firm can sell all that it produces.
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