A health food manufacturer makes two types of protein shakes, Whey and Vegan. Each mixture contains vitamins, protein, and carbohydrates, in the following proportions: Carbohydrates (g) Protein (g) Vitamin (g) Whey 100 400 300 Vegan 200 300 100 Minimum dietary requirements are that a protein shake contain at least 0.9kg of vitamins, 2.2kg of protein, and 0.8kg of carbohydrate. Whey costs N$20 per kilogram to produce, and Vegan costs $12.50 per kilogram to produce. Find the number of kilograms of each protein shake that should be produced to minimize cost