4 120 5 60 6 80 For a given item, suppose these are our net requirements over the coming 6 weeks. Week 1 2 3 Net Ree's 140 35 85 Suppose we enter this schedule horizon with 60 units to inventory. Further suppose that: Setup cost is $200 Holding cost (per unit per week of average Inventory) is $2 If we are using Part-Period Balancing to setorder quantities, our Week 1 arrival/receipt should be Type your answer units