Problem 2: Consider the following modification of the process described in Problem 1. The process is identical except that now a rework step has been added for units that do not pass inspection at step C. Rework requires 10 minutes/unit and is staffed by an additional operator. Raw Material A B Finished Units Pass Inspection C Rework 3 min. / unit 5 min. / unit 2 min. / unit Fail Inspection 10 min. unit What is the maximum fraction of products that can be defective before rework becomes the bottleneck of this process?