Solve the problem.A doctor has told a patient to take vitamin pills. The patient needs at least 28 units of vitamin A, at least 8 units of vitamin C, and at least 76 units of vitamin D. The red vitamin pills cost
each and contain 8 units of A, 1 unit of C, and 7 units of D. The blue vitamin pills cost
each and contain 3 units of A, 1 unit of C, and 11 units of D. How many pills should the patient take each day to minimize costs?
A. 5 red and 3 blue
B. 8 red and 0 blue
C. 3 red and 5 blue
D. 4 red and 4 blue
Answer: C
Mathematics