Final answer:
The equivalent units of production for material costs is 30,800 units.
Step-by-step explanation:
To calculate the equivalent units of production for material costs, we need to add together the units completed and transferred out with the units in ending work in process, adjusted for the percentage of completion.
In this case, the units completed and transferred out are 26,300, and the units in ending work in process at 50% completion are 4,500 (9,000 units * 50%). Therefore, the equivalent units of production for material costs is 26,300 + 4,500 = 30,800 units.