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 Kiki's records show the following for the month of January. Sales totaled 300 units. Date Units Unit Cost Total Coat Beginning Inventory January 1 140 $ 80 $ 11,200 Purchase January 15 310 90 27,900 Purchase January 24 200 110 22.000 Required: 1. Calculate the number and cost of goods available for sale. 2. Calculate the number of units in ending inventory. 3. Calculate the cost of ending inventory and cost of goods sold using the (a) FIFO. (6) LIFO, and (c) welghted average cost methods