West Company opened a new store on January 1, 2020. During 2020, the following purchases and sales of inventory were made: Jan 5 Purchase 10 units @$100 Jun 11 Purchase 10 units @ $120 Jun 19 Sales 15 units @ $200 Oct 18 Purchase 15 units @150 Dec 20 Purchase 20 units @ 160 Dec 22 Sales 19 units @ $210 Calculate the cost of ending inventory, cost of goods sold (COGS) and gross profit using weighted average perpetual