Area Addison, Inc. uses a perpetual inventory system. Information about one inventory item for the month of September follows. Date Line Item Description Units and Cost Sep. 1 Inventory 20 units at $20 4 Sold 10 units 10 Purchased 30 units at $25 17 Sold 20 units 30 Purchased 10 units at $30 If Addison uses LIFO, the September 30 inventory balance is If Addison uses FIFO, the September 30 inventory is?