Diston Company uses the weighted-average method in its process costing system. The first processing department, the Welding Department, started the month with 18,000 units in its beginning work in process inventory that were 30% complete with respect to conversion costs. The conversion cost in this beginning work in process inventory was $44,820. An additional 90,000 units were started into production during the month. There were 21,000 units in the ending work in process inventory of the Welding Department that were 10% complete with respect to conversion costs. A total of $677,970 in conversion costs were incurred in the department during the month.A. $8.112 B. $8.300 C. $7.533 D. $6.108