3.5-5.* Fred Jonasson manages a family-owned farm. To supple- ment several food products grown on the farm, Fred also raises pigs for market. He now wishes to determine the quantities of

the available types of feed (corn, tankage, and alfalfa) that should be given to each pig. Since pigs will eat any mix of these feed types, the objective is to determine which mix will meet certain nutri- tional requirements at a minimum cost. The number of units of each type of basic nutritional ingredient contained within a kilogram of each feed type is given in the following table, along with the daily nutritional requirements and feed costs: