nacio Corporation uses the weighted-average method in its process costing system. Data concerning the first processing department for the most recent month are listed below: Beginning work in process inventory: Units in beginning work in process inventory 800 Materials costs $ 12,900 Conversion costs $ 5,000 Percent complete with respect to materials 75% Percent complete with respect to conversion 20% Units started into production during the month 9,500 Units transferred to the next department during the month 8,400 Materials costs added during the month $ 172,000 Conversion costs added during the month $ 240,200 Ending work in process inventory: Units in ending work in process inventory 1,900 Percent complete with respect to materials 90% Percent complete with respect to conversion 30% The cost per equivalent unit for materials for the month in the first processing department is closest to: Multiple Choice $17.01 $17.95 $16.70 $18.29