Rusthe Inc. uses a periodic inventory system. Its records show the following for the month of May, in which 74 units were sold. Date Explanation Units Unit Cost Total Cost May 1 Inventory 30 $9 $270 15 Purchase 25 10 250 24 Purchase 38 11 418 Total 93 $938 Collapse question part (a) Calculate the weighted-average unit cost. (Round answer to 3 decimal places, e.g. 5.125.) Weighted-average unit cost