Product mix decision with the "bottleneck method" Consider a batch process used to produce two products--ePhone and ePad. There are four workstations, W, X, Y and Z, in this process. Each of W, X, and Z has one machine and is staffed with one dedicated worker. Workstation Y has two identical sets of a machine and a dedicated worker, so this workstation has "doubled available production time". The process flowcharts for producing them are shown below. The process flowcharts also provide the workload per unit of product (i.e., required processing time on one machine/worker) at each step, demands per week, prices per unit, and costs of inputs. Workstations and their workers operate 40 hours a week. $20 Workstation X (6 min/unit) Workstation 2 (4 min/unit) Workstation Y (10 min/unit) Product: ePhone Price: $220/unit Demand: 300/week Raw materials $90 Purchased parts $20 Workstation W (5 min/unit) Workstation Y (6 min/unit) Workstation X (4 min/unit) Product: ePad Price: $185/unit Demand: 250/week Raw materials $85 Purchased parts Please use the "bottleneck method" to find the optimal product mix and answer the following questions: The bottleneck of this process is: [Select ] For ePhone, we produce a quantity in the range of [Select] For ePad, we produce a quantity in the range of [Select]