Carter 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. Work in process, beginning: Units in beginning work-in-process inventory 600 Materials costs $6,900 Conversion costs $2,500 Percentage complete for materials 80% Percentage complete for conversion 15% Units started into production during the month 6,300 Units transferred to the next department during the month 5,800 Materials costs added during the month $112,500 Conversion costs added during the month $210,300 Ending work in process: Units in ending work-in-process inventory 1,100 Percentage complete for materials 70% Percentage complete for conversion 40% Required: Calculate the equivalent units for materials (using the weighted-average method) for the month in the first processing department