In its first month of operations, Wildhorse Co. made three purchases of merchandise in the following sequence: 200 units at $6; 250 units at $5; and 300 units at $4. There are 420 units on hand at the end of the period, Wildhorse uses a periodic inventory system. (a) Calculate the cost of the ending inventory and cost of goods sold under FIFO. FIFO Ending inventory 21,000 Cost of goods sold