Addison, Inc. uses a perpetual inventory system. The following is information about inventory for the month of September: Sep. 1 Inventory 5 Sold 12 Purchased 18 Sold 30 Purchased Calculate Ending Inventory using: 30 units at $10 20 units 20 units at $20 15 units 10 units at $30 FIFO : LIFO: Using the folk Purcha Merche Septem Sales allowa