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 270 units. \begin{tabular}{|l|l|c|} \hline & Cost of Ending Inventory & Cost of Goods Sold \\ \hline FIFO & \\ \hline LIFO & \\ \hline Weighted Average Cost & \\ \hline \end{tabular}