Answer: 74,100 units
Step-by-step explanation:
If the materials are added at the beginning of the process then the opening work in process inventory would need to be deducted from the completed inventory for the period. Also there would be no need to multiply the units by their completion level because they are assumed to be at 100% completion because materials were added at the very beginning.
Total equivalent units for direct materials is:
= (Completed units - Opening inventory) + Closing work in process
= (74,900 - 4,500) + 3,700
= 74,100 units