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 use the lot-for-lot technique. The master schedule requires 80 units of product A in week 5 and 120 units in week 8. Draw the product structure tree for this product and produce the MRP net requirement plans for product A and all its components & parts for the upcoming eight weeks.