A patient takes vitamin pills. Each day he must have at least 630 IU of vitamin​ A, 5 mg of vitamin Upper B 1​, and 80 mg of vitamin C. He can choose between pill​ 1, which contains 150 IU of vitamin​ A, 1 mg of vitamin Upper B 1​, and 10 mg of vitamin​ C, and pill​ 2, which contains 90 IU of vitamin​ A, 1 mg of vitamin Upper B 1​, and 40 mg of vitamin C. Pill 1 costs 25cents​, and pill 2 costs 50cents. Complete parts a and b below.