SHOW THE ALL STEPS PLS

7) The demand for item A in weeks 5, 6, 7, 8, 10, and 11 are 75, 100, 80, 120, 60, 150 units, respectively. Setup costs for part D and F are $500 and $100 and, holding costs for part D and F are $3 and $2.5, respectively. Consider the following data. Item O Parent Quantity Needed Lead for One Unit of Time Parent (week) n-hand Inventory at the end of week 0 (units) Scheduled Receipt (units) Safety Stock Level Lot-sizing policy in LFL on in 20 units week 9 10 units week 4 50 units week 2 75 units Week 7 - in 90 and multiples 100 and multiples Silver Meal in LFL Least Unit Cost a) (6 pts) Draw the product tree for item A. b) (24 pts) Determine the planned order releases for all items