Nutrifeed requires a minimum of 2,000 mineral units, 3,000 calories, and 4,000 units of vitamins per day for each hog. Each pound of oats supplies 200 mineral units, 100 calories, and 200 units of vitamins. Each pound of corn supplies 100 mineral units, 200 calories, and 200 units of vitamins. Formulate this problem as a linear programming problem.