Problems 45-48 involve three variables. Solve them with the simplex method, Excel, or some other technology.
Medicine A medical clinic performs three types of medical tests that use the same machines. Tests A, B, and C take 15 minutes, 30 minutes, and 1 hour, respectively, with respective profits of $150, $250, and $500. The clinic has four machines available. One person is qualified to do test A, two to do test B, and one to do test C. If the clinic has a rush of customers for these tests, how many of each type should it schedule in a 12-hour day to maximize its profit?
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