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 290 units. Date Units Unit Cost Total Cost Beginning Inventory January 1 140 $ 80 $ 11,200 Purchase January 15 330 90 29,700 Purchase January 24 250 110 27,500 Required: Calculate the number and cost of goods available for sale. Calculate the number of units in ending inventory. Calculate the cost of ending inventory and cost of goods sold using the (a) FIFO, (b) LIFO, and (c) weighted average cost methods