Shamrock, Inc. uses a periodic inventory system and reports the following for the month of June. Date Units Unit Cost Total Cost June 1 Explanation Inventory Purchases 105 $5 12 350 6 $ 525 2,100 1.400 23 Purchases 200 7 30 Inventory 250 (a1) Your answer is incorrect. Calculate weighted-average unit cost. (Round answer to 3 decimal places, e.g. 5.125.) Weighted average unit cost $