please show me your computation on how did you get your answer. thanks

6. Domingo Corporation uses the weighted-average method in its process costing system. This month, the beginning inventory in the first processing department consisted of 400 units. The costs and percentage completion of these units in beginning inventory were Percent Complete 5096 20% Cost S 5,500 S 1,700 Materials costs Conversion costs A total of 6,800 units were started and 6,100 units were transferred to the second processing department during the month. The following costs were incurred in the first processing department during the month Cost $ 158,700 $ 120,400 Materials costs Conversion costs The ending inventory was 85% complete with respect to materials and 75% complete with respect to conversion costs. The cost per equivalent unit for materials for the month in the first processing department is closest to a. $22.0-4 b. $22.8:1 c. $23.34 d. $22.56