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.

DateUnitsUnit CostTotal CostBeginning InventoryJanuary 1240$80$19,200PurchaseJanuary 153609032,400PurchaseJanuary 2420011022,000

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,(b)LIFO, and(c)weighted average cost methods.