REI sells snowboards. Assume the following information relates to REI's purchases of snowboards during September. During the same month, $106$ snowboards were sold. REI uses a periodic inventory system. Date Sept. $1$ Sept. $12$ Sept. $19$ Sept. $26$ Explanation Units Unit Cost Inventory $$105$ Purchases Purchases Purchases Totals $15475222136108109110$ Total Cost $$1,5755,0765,6682,420$ $$14,739$ REI sells snowboards. Assume the following information relates to REl's purchases of snowboards during September. During the same month, $106$ snowboards were sold. REI twes a periodic inventory system.