Suppose that I have an item that has a demand of $3000$ units per month, $30$ days$/$month assumed.

a$)$ Suppose that I have an ordering policy that every Sunday morning, right before I open my store, I look at my remaining inventory of the item and make a decision on how much to order. This is known as a periodic review approach to inventory. If this item has a lead time of one day and I find on this Sunday morning that I have $200$ units of inventory left, how many would I order to last me through the week?