Comparing ending merchandise inventory, cost of goods sold, and gross profit using the periodic inventory system-FIFO, LIFO, and weighted. Average methods Assume that Coffee Shop completed the following periodic inventory transactions for a line of merchandise inventory: Compute ending merchandise inventory, cost of goods sold, the FIFO inventory costing method. Compute ending merchandise inventory, cost of goods sold, and gross profit the LIFO inventory costing method. Compute ending merchandise inventory, cost of goods sold, and gross profit using the weighted-average inventory costing method (Round weighted-average cost per unit to the nearest cent and all other amounts to the nearest dollar.)