4. index corporation uses the fifo method in its process costing system. the first processing department, the forming department, started the month with 17,000 units in its beginning work in process inventory that were 10% complete with respect to conversion costs. the conversion cost in this beginning work in process inventory was $9,010. an additional 76,000 units were started into production during the month and 83,000 units were completed and transferred to the next processing department. there were 10,000 units in the ending work in process inventory of the forming department that were 70% complete with respect to conversion costs. a total of $445,915 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