Use the two steps for solving a linear programming problem, given in the box on page 606, to solve the problems in Exercises 17–23.

A large institution is preparing lunch menus containing foods A and B. The specifications for the two foods are given in the following table:Each lunch must provide at least 6 units of fat per serving, no more than 7 units of protein, and at least 10 units of carbohydrates. The institution can purchase food A for $0.12 per ounce and food B for $0.08 per ounce. How many ounces of each food should a serving contain to meet the dietary requirements at the least cost?

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Food A B Units of Fat per Ounce 1 1 Units of Carbohydrates per Ounce 2 1 Units of Protein per Ounce 1 1