Diston Company uses the weighted-average method in its process costing system. The first processing department, the Welding Department, started the month with 23,000 units in its beginning work in process inventory that were 15% complete with respect to conversion costs. The conversion cost in this beginning work in process inventory was $45,010. An additional 81,000 units were started into production during the month and 85,000 units were completed in the Welding Department and transferred to the next processing department. There were 19,000 units in the ending work in process inventory of the Welding Department that were 15% complete with respect to conversion costs. A total of $680,000 in conversion costs were incurred in the department during the month. The cost per equivalent unit for conversion costs for the month is closest to:

$6.249

$8.395

$8.253

$8.441