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 $110, $240, and $490. the clinic has four machines and four workers 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?