The chapter makes a distinction between stocks and flows. In this example, the “stock” is the amount of inventory on hand at any one time. The “flows” are the purchases of inventory and the costs of the inventory sold to customers. Use the information shown to find the missing items.

Beginning Purchases Cost of Goods Sold Inventory Ending Inventory a. 20 200 185 ? b. 100 500 ? 120 C. 0 ? 175 10 d. ? 350 425 100