What are the Molding Department's equivalent units related to conversion costs for January?

A) 77,950
B) 80,750
C) 83,750
D) 84,250

Weighted-average method
Equivalent units of production = Units transferred to the next department or to finished goods + Equivalent units in ending work in process inventory = 79,000 + 0.25 × 7,000 = 80,750
Reference: CH05-Ref2
Arona Corporation manufactures canoes in two departments, Fabrication and Waterproofing.In the Fabrication Department, fiberglass panels are attached to a canoe- shaped aluminum frame.The canoes are then transferred to the Waterproofing department to be coated with sealant.Arona uses a weighted-average process cost system to collect costs in both departments.
All materials in the Fabrication Department are added at the beginning of the production process.On July 1, the Fabrication Department had 30 canoes in process that were 20% complete with respect to conversion cost.On July 31, Fabrication had 20 canoes in process that were 40% complete with respect to conversion cost.During July, the Fabrication Department completed 70 canoes and transferred them to the Waterproofing Department.