5. (15 points) A farmer mills his own cattle feed and has the following information. X Corn Hay Soybeans Salt Vitamin A Cost 5.25 1.25 11 25 20 Protein 1.75 2 5.5 0 0 Fat 0.35 0.05 0.15 O 0 Salt 0.01 0 0.01 1 0 Vitamin A 0 0 0 0 Energy 1.5 0.5 1.25 O 0 He wants to create the lowest cost feed with the following requirements: protein is betv and 3000 units, fat is between 20 and 40 units, salt is at least 100 units, vitamin A is at units, and energy is at least 250 units. a) What is the standard format? (1 pt)