The following activities and times were recorded for a mold operator: removes molded piece from die 0.6, walks 10ft to a work bench 0.2, boxes widget and places on conveyor 1.0, walks back to molder 0.2,blow out dirt from mold 0.4, sprays oil into dirt pushes go 0.2, mold cycles automatically 3.0, the cycle then repeats itself. The operator is paid 10/h and pays 15/h to run the molder. What is the optimal number of machines that can be assigned to the operator to produce the widget at low cost? Draw work machine chart.