The following activities and times (in minutes) were recorded for a press operator: removes completed widget from press (0.1), files rough edges on widget (0.4), blows filings from widget (0.3), places widget on conveyor to next station (0.1), places raw blank into press and pushes "GO" (0.1), press cycles automatically for 3.0 min. The cycle then repeats itself. The operator is paid $10.00/hr and it costs $15.00/hr to run the press. What is the optimum number of presses that can be assigned to the operator to produce the widgets at lowest cost? Draw a worker-machine chart. What is the %idle time? What is the unit cost? What is the productivity (widgets/hr)?