If 10,000 units that were 50% completed are in process at November 1, 90,000 units were completed during November, and 20,000 were 20% completed at November 30, the number of equivalent units of production for November was 90,000. (Assume no loss of units in production and that inventories are costed by the first-in, first-out method.)

The equivalent units of production for November would account for the units completed during November, the work done on the units that were in process at the beginning of the month, and the work done on the units that were partially completed at the end of the month. The calculation would include the 90,000 units completed, plus the additional work to finish the 10,000 units that were 50% complete at the beginning of the month (5,000 equivalent units), and the work done on the 20,000 units that were 20% complete at the end of the month (4,000 equivalent units), totaling 99,000 equivalent units.