please help me find answer to this table

Beginning inventory, purchases, and sales data for portable game players are as follows: The business maintains a perpetual inventory system, costing by the first-in, first-out method. a. Determine the cost of the merchandise sold for each sale and the inventory balance after each sale, presenting Exhibit 3. Under FIFO, if units are in inventory at two different costs, enter the units with the LOWER unit cost first Unit Cost column and in the Inventory Unit cost column