costing system

Winkle Corporation uses the FIFO method in its process costing system. Beginning inventory in the mixing processing center consisted of 5,000 units, 90% complete with respect to conversion costs. Ending work in process inventory consisted of 2,000 units, 60% complete with respect to conversion costs. If 10,000 units were transferred to the next processing center during the period, how many would the equivalent units for conversion costs be?

A. 13,200 units

B. 12,000 units

C. 6,700 units

D. 10,000 units