REI sells snowboards. Assume the following information relates to REI's purchases of snowboards during September. During the same month, 102 snowboards were sold. REI uses a periodic inventory system. Date Explanation Units Unit Cost Total Cost Sept. 1 Inventory 14 $120 $ 1,680 Sept. 12 Purchases 52 123 6,396 Sept. 19 Purchases 60 124 7,440 Sept. 26 Purchases 24 125 3,000 Totals 150 $18,516