first-out (FIFO) method; (b) the last-in, first-out (LIFO) method; and (c) the weighted average cost method (Round per unit cost to two decimal places and your final answer to the nearest whole dollar). Feedback * Creok My Werk a. When the FIFO method is used, costs are included in cost of merchandise sold in the order in which they were purchased. b. When the LIFO method is used, the cost of the units sold is the cost of the most recent purchases. c. The average cost method is sometimes called the welghted average method. The average cost method uses the rverage unit cost tor detiemising cois of merchandise sold and the onding merchandise inventory