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 costbeginning inventory january 1 220 80 $17,600purchase january 15 310 90 27,900purchase january 24 270 110 29,700required: 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