Hall 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. Materials costs. 500 $7,700 Conversion costs.. $2,900 Percent complete with respect to materials... 75% Percent complete with respect to conversion. 25% Units started into production during the month 6,700 Units transferred to the next department during the month. 5,900 Materials costs added during the month..... Conversion costs added during the month. Ending work in process inventory: Units in ending work in process inventory. Percent complete with respect to materials.... Percent complete with respect to conversion. What are the equivalent units for materials for the month in the first $108,600 $121,000 1,300 65% 40% processing department? Select one: O a. 845 O b. 6,745 O c. 7,200 d. 5,900