Panther 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 600 Materials costs $ 7,300 Conversion costs $ 2,300 Percent complete with respect to materials 5096 Percent complete with respect to conversion 10 % Units started into production during the month 9,400 Units transferred to the next department during the month 8,600 Materials costs added during the month $ 196,300 Conversion costs added during the month $ 315,800 Ending work in process inventory Units in ending work in process inventory 1,400 Percent complete with respect to materials 7096 Percent complete with respect to conversion 4096 The cost per equivalent unit for materials for the month in the first processing department is closest to Select one: OA $21.25 OB $14.48 OC. S15.88 OD $16.31