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 50 % 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 70% Percent complete with respect to conversion 40% The cost per equivalent unit for materials for the month in the first processing department is closest to Select one: OA $21.25 OB $15.88 OC. $14.48 OD $16.31