Diamant Company uses the weighted-average method in its process costing system. The first processing department, the Welding Department, started the month with 22,000 units in its beginning work in process inventory that were 20% complete with respect to conversion costs. The conversion cost in this beginning work in process inventory was $23,200. An additional 97,000 units were started into production during the month and 110,000 units were completed in the Welding Department and transferred to the next processing department. There were 18,000 units in the ending work in process inventory of the Welding Department that were 60% complete with respect to conversion costs. A total of $520,300 in conversion costs were added in the department during the month. What would be the cost per equivalent unit for conversion costs for the month? a. $6.26 b. $5.46 C. $5.11 d. $5.90 e. $4.50