Final answer:
The equivalent units for conversion costs is 90,100 units.
Step-by-step explanation:
The equivalent units for conversion costs can be calculated by adding the units started and completed during the period to the ending work in process (WIP) units. In this case, the units started and completed during the period are 90,000 units, and the ending WIP units are given as 100 units. Therefore, the equivalent units for conversion costs is 90,000 + 100 = 90,100 units.