Suppose that your company uses a periodic review system. Your company has a monthly demand of 12,000 units (assume 30 days per month), and they review their inventory every 4 days. They always carry 75 units of safety stock, and they know that their lead time is 4 days. Given that they have 40 units on hand, 400 units in incoming inventory, and no backorders, how many units should they order today (assume that today is a review day)? SHOW WORK.