Answer:
the total number of units started and completed = 11,000 units
Step-by-step explanation:
total materials costs incurred during the month = $500,000
if materials are added at the beginning of the process, beginning WIP already had 100% of materials costs added, therefore, materials costs were applied only to the total number of units started
total number of units started = $500,000 / $25 cost per EUP = 20,000 units
the total number of units started and completed = units started - ending WIP = 20,000 - 9,000 = 11,000 units
total number of units completed = beginning WIP + units started - ending WIP = 12,000 + 20,000 - 9,000 = 23,000 units