Sam Company had the following balances and transactions during 2020 Beginning inventory March 10 June 10 October 30 10 units at ORTO Sold 8 units Purchased 20 units at OR80 Sold 15 units What would the company's Inventory amount be on the December 31, 2020 balance sheet, if the periodic average costing method is used? (Answers are rounded to the nearest Select one O a OR537 Ob OR 554 Oc OR 490 Od OR 50 TOSHIBA