ABC Company uses a perpetual inventory system. The following information is available for the various transactions occurring in January 2020. January 1 Balance 200 units @ $20 January 13 Sale 250 units @ $50 Purchase 150 units @ $30 25 Sale 460 units @ $50 10 20 Purchase 500 units @ $40 Required: Calculate the Cost of goods sold and the Ending inventory assuming that the company uses: a) the LIFO assumption b) the moving average assumption