Waterway Company uses a periodic system reports the following for the month of June. Unit Cost $7 8 June 1 12 23 30 Units 300 300 420 310 110 Inventory Purchase Purchase Inventory Total Cost $ 2,100 3,360 2,790 (a) Compute the cost of the ending inventory and the cost of goods sold under FIFO and LIFO. FIFO LIFO Cost of the ending inventory Cost of goods sold