The following inventory details of XXL company Date Description January 1, 2018 Opening inventory February 10, 2018 Purchases March 5, 2018 Sales Abril 15, 2018 Purchases Units Cost 10 $10 20 $15 25 30 $20 20 December 10, 2018 Sales By Perpetual Inventory System, calculate: Cost of Goods Sold and Cost of Ending Inventory under a) FIFO b) LIFO