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Waller Co. uses a weighted-average process-costing system. Material B is added at two different points in the production of shirms, 40% is added when the units are 20% completed, and the remaining 60% of Material B is added when the units are 80% completed. At the end of the quarter, there are 22,000 shirms in process, all of which are 50% completed. With respect to Material B, the ending shirms in process represent how many equivalent units?