During its first year of operation, Bellows Company purchased 5,600 units of a product at $21 cm During the second year, it purchased 6,000 units of the same product at $24 per unit During the third year, it purchased 5,000 units at $30 per unit. Bellows Company managed to have an ending inventory each year of 1 ,000 units. The company uses the periodic inventor)' system. Prepare cost of goods sold statements that compare the value of ending inventory and the cost of goods sold for each of the three years using (1) the FIFO inventory costing method and (2) the LIFO method. From the resulting data, what conclusions can you draw about the relationships between changes in unit price and changes in the value of ending inventory?