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 310 units Date Units Unit Cost Total Cost Beginning Inventor Purchase Purchase January anuary 15 anuary 24 140 470 240 $ 85 95 115 $11,900 44,650 27,600 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, (b) LIFO, and (c) weighted average cost methods