can someone explain how to do this ? im reviewing !

21 Lucas 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 Conversion costs Percent complete with respect to materials Percent complete with respect to conversion 900 $ 9,600 $7,700 60% 45% Units started into production during the month Units transferred to the next department during the month Materials costs added during the month Conversion costs added during the month Ending work in process inventory: 8,100 6,900 $115,800 $ 120,500 Units in ending work in process inventory Percent complete with respect to materials Percent complete with respect to conversion 2,100 75% 20% The cost per equivalent unit for material costs for the first department for the month is closest to (Round to 2 decimal places) O $18.39 O $15.36 $14.80 O $16.34