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estion 52 A life-insurance salesman spends 12 hours a week on the telephone soliciting new clients. From past experience, the salesman it yet estimates that each hour spent calling students, blue-collar workers, and professionals will produce the following number of swered additional sales: arked out of 000 Number of Additional Sales Flag question Hours Blue-Collar Calling Students Workers Professionals 0 0 O 25 29 23 23 26 21 OUIAWN- O 21 23 19 19 21 18 16 19 16 15 16 15 How should the life-insurance salesman allocate his phone-calling time to maximize the number of sales? Hours spent calling students = Hours spent calling blue-collar workers = Hours spent calling professionals =