Please show work The supervisor at the precision machine shop wants to determine the staffing policy that minimizes the total operating cost. The average arrival rate at the tool crib, where tools are dispensed to the workers, is 5 machinists per hour. Each machinist pay is 10 per hour. The supervisor can staff the crib either with a junior attendant who is paid 10 per hour and can process 14 arrivals per hour or with a senior attendant who is paid 16 per hour and can process 18 arrivals per hour. Which attendant should be selected/ The _______ should be selected with a total hourly cost of ____ ( rounded two decimal places)