Answer the following problems: (3 points for problems 1 & 4, and 2 points for Problems 2 & 3) 1. Eagle Fabrication has the following aggregate demand requirements and other data for the upcoming four quarters. 3 4 Quarter Demand Previous quarter's output 1500 units 1 1300 Beginning inventory 200 units 2 1400 Stock-out cost $50 per unit Inventory holding cost $10 per unit at end of 1500 Iquarter 1300 Hiring workers $4 per unit Laying off workers $8 per unit Unit cost $30 per unit Overtime $10 extra per unit Subcontracting cost $60 per unit Which of the following production plans is better? a) Plan A-chase demand by hiring and layoffs; b) Plan B-produce at a constant rate of 1000 and obtain the remainder from overtime; c) Plan C-produce at a constant rate of 1200 and obtain the remainder from subcontracting, 2. A very simple product (A) consists of a base (B) and a casting (C). The base consists of a plate (P) and three fasteners (F). There are currently 30 castings and 100 bases on hand. Final assembly takes one week. The casting has a lead time of three weeks. All other parts have one week lead times. There are no scheduled receipts. All components are lot-for-lot. The MPS requires 120 units of product A in week 8. a) Develop the time-phased product structure. b) Produce the MRP for fulfilling the order. 6 8 7 0 500 400 3. Consider the following requirements for a certain product. Period 1 23 4 5 Gross requirements 0 200 200 0 400 Beginning inventory = 500 units Setup cost - $500 per setup Lead time = 1 week Holding cost $3 per unit per week a) Develop the EOQ MRP table. Calculate the total relevant costs. b) Develop the EPP MRP table. Calculate the total relevant costs. 4. Jack's Refrigeration Repair is under contract to repair, recondition, and/or refurbish commercial and industrial icemakers from restaurants, seafood processors, and similar organizations, Jack currently has five jobs to be scheduled, shown in the order in which they arrived. Job Processing Time (hours) Due (hours) 25 35 15 50 V W X Y Z 24 90 50 65 20 40 a) Complete the following table. (Show your supporting calculations below). b) Which dispatching rule has the best score for flow time? c) Which dispatching rule has the best score for work-in-process (jobs in the system)? d) Which dispatching rule has the best score for lateness? e) What dispatching rule would you select? Support your decision. Average Flow Time Average Number of Jobs Average Lateness Job Sequence Dispatching Rule FCFS SPT EDD CR