The following transactions happened for a retailer in January: Date Transaction # of Units | Cost per Unit 1/1 Beginning Inventory300 1/8Purchase 1/12 Sale 1/29 Purchase 1/30 Sale $7 $8 450 350 750 550 | $9 Required Calculate cost of goods sold and ending inventory for the following cost flow assumptions (perpetual inventory system): 1. LIFO; 2. FIFO; 3. Average Cost