Waterway Company had a beginning inventory on January 1 of 180 units of Product 41815 at a cost of $20 per unit. During the year; purchases were as follows. Watenway Company uses a periodic inventory system. Sales totaled 1,180 units. Determine the ending inventory and the cost of goods sold under each of the assumed cost flow methods (FIFO, LIFO, and average-cost). (Round answers to 0 decimal places, eg. 1,250.)