Brody Corp uses a process costing system. Beginning inventory for January consisted of 1,000 units that were 40% completed. 10,000 units were started into the process during January. On January 31, the inventory consisted of 500 units that were 70% completed. What would be the equivalent units for conversion cost using the weighted average method?

(Please explain how to find the answer)

A. 10,000

B. 11,000

C. 10,850

D. 10,450