Clumber Company produces plastic cups in a one-department process. The following data is available for the past month:

Work -in-process inventory, beginning: 0

Units started: 60,000

Units completed and transferred: 48,000

Work-in-process inventory, ending: 12,000

The units in process at the end of the month are 100 percent coomplete with respect to materials and 50 percent complete with respect to conversion costs. What are the equivalent units for conversion costs for the month?

A. 60,000

B. 54,000

C. 12,000

D. 30,000