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Metaline Corp. uses the weighted average method for inventory costs and had the following information available for the year. The number of units transferred to finished goods during the year is: Beginning Work in Process (50% complete, $1,800) Ending inventory of Work in Process (90% complete) Total units started during the year 270 units 470 units 3,900 units O 3,900 units. 4,100 units. O 4,458 units. 3,700 units. 3,882 units