Agri$-$Pro is a company that sells agricultural products to farmers in a number of provinces. One service that it provides to customers is custom feed mixing, for which a farmer can order a specific amount of livestock feed and specify the amount of corn, grain, and minerals that the feed should contain. This is an important service because the proper feed for various farm animals changes regularly depending upon the weather, and pasture conditions, for example. Agri$-$ Pro stocks bulk amounts of four types of feeds that it can mix to meet a given customer$$s specifications. The following table summarizes the four feeds; their composition of corn, grain, and minerals; and the cost per kilogram for each feed type