A full glass of whole milk contains 4 grams of fat, 10 grams of protein, 30% calcium, and 100 IU (International Unit) of vitamin D. A full glass of 2% milk contains 2 grams of fat, 7 grams of protein, 45% calcium, and 120 IU of vitamin D. Finally, a full glass of skim milk contains 1 gram of fat, 9 grams of protein, 50% calcium, and 120 IU of vitamin D. The patient needs to drink milk every day to obtain at least 15 grams of protein, 70% of calcium, 250 IU of vitamin D, and at most 5 grams of fat. The cost of whole, 2%, and skim milk are $0.85, $1.10, and $1.15 per glass, respectively. What is the objective function?
