Can someone help with the question below please show the working i got A

Can someone help with the question below

please show the working

i got A. 85120 Not sure if its right

thank you

Borwan Company uses the weighted-average method in its process costing system. The Assembly Department started the month with 6900 units in
its beginning work in process inventory that were 70% complete with respect to conversion costs. An additional 79000 units were transferred in
from the prior department during the month to begin processing in the Assembly Department. There were 3900 units in the ending work in process
inventory of the Assembly Department that were 20% complete with respect to conversion costs. What were the equivalent units for conversion
costs in the Assembly Department for the month?

A 85120

B 82000

C 85900

D 82780