Answer:
an order of 40 units should be placed at week 4 to get 40 unit by week 5 and complete 300 items.
Explanation:
300 units required in week 5 Â
We will have 20 + 120 + 120 = 260 units by week 5 from the stock and scheduled receipts.
We need 40 more, given lead time = 1 week.
Therefore, an order of 40 units should be placed at week 4 to get 40 unit by week 5 and complete 300 items.