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Addison. Inc. uses a perpetual inventory system. The following is information about one inventory item for the month of September: Sep. 1 Inventory 20 units at $20 Sold 10 units 10 Purchased 30 units at $25 17 Sold 20 units Purchased 10 units at $30 If Addison uses FIFO. the cost of the ending merchandise inventory on September 30 is $800 $650 $750 $700