Oahu Kiki tracks the number of units purchased and sold throughout each accounting period but applies its inventory costing method at the end of each month, as if it uses a periodic inventory system. Assume Oahu Kikis records show the following for the month of January. Sales totaled 320 units. Beginning Inventory Purchase Purchase Date Units Unit Cost Total Cost January 1 180 $ 70 $12,600 January 15 490 80 39,200 January 24 280 100 28,000 Required: 1. Calculate the number and cost of goods available for sale. Number of Goods Available for Sale units Cost of Goods Available for Sale 2. Calculate the number of units in ending inventory. Ending Inventory units 3. Calculate the cost of ending inventory and cost of goods sold using the (a) FIFO, (b) LIFO, and (c) weighted average cost methods