20-21. During 2018, Liberty Company has the following inventory transactions. Date Transaction Units Total Cost $4,400 8,200 7,560 Cost Beginning inventory Jan. 1 11 $400 Jan. 8 Purchase 20 410 Jan. 15 Purchase 18 420 Jan. 19 Sales 44 Required: Using FIFO with a periodic inventory system, calculate cost of goods sold, ending inventory