A refinery produces two grades of gasoline: regular and premium by blending two types of crude oil. Although the two types of crude contain the two important ingredients required to produce both gasoline,the percentage of important ingredients in each type of crude oil differs, as does the cost per gallon. The percentage of ingredient A and B in each type of crude oil and the cost per gallon are shown below. Crude 0il Cost Ingredient Ingredient B $0.10 20% 60% $0.15 50% 30% Each gallon of regular must contain at least 40% of A, whereas each gallon of premium can
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