Given below is inventory information for the month of June obtained from the records of TAT Co. PURCHASES SALES Unit Unit Date Description Units Date Description Units cost price Beginning June June 1 2 Sold 5 Inventory 10 11 Purchased 3 15 Sold 60 5 20 Purchased 60 4 27 Sold 35 5 40 30 90 Required: Compute COGS and ENDING INVENTORY COST under the following cost flow assumptions: a) FIFO - Periodic Inventory System b) AVERAGE - Periodic Inventory System c) FIFO - Perpetual Inventory System d) AVERAGE - Perpetual Inventory System e) Explain the reason for the difference in results under Average-cost for both Perpetual and Periodic system