5) Linear Programming: A nutritionist advises an individual who is suffering from iron and vitamin deficiency to take at least 2400 milligrams (mg) of iron, 2100 mg of vitamin B1 (thiamine), and 1500 mg of vitamin B2 (riboflavin) over a period of time. Two vitamin pills are suitable, brand A and brand B. Each brand pill costs cents and contains 40 mg of iron, 10 mg of vitamin B1, and mg of vitamin B2. Each brand B pill costs 8 cents and contains 10 mg of iron, 15 mg of vitamin B1, and 15 mg of vitamin B2. What combination of pills should the individual purchase in order to meet the minimum iron and vitamin requirements at the lowest cost?