b.
The FIFO method, by assigning the costs of the most recent purchases to inventory, provides the most realistic year-end amount for inventory in terms of NRV. A weakness in the FIFO method, however, is that the costs assigned to the cost of goods sold are relatively old costs. Because the costs of the units has been rising throughout the year, the FIFO method tends to understate the cost of goods sold in terms of the costs actually being incurred by Tokyo to replenish its inventory. The inventory method using weighted average cost assigns the more recent costs to the cost of goods sold and therefore provides a more realistic measure of profit, in terms of NRV, than does the FIFO method.