Bistrol Corporation uses the weighted-average method in its process costing system. This month, the beginning inventory in the first processing department consisted of 800 units. The costs and percentage completion of these units in beginning inventory were: Cost Percent Complete Materials costs$15,700 75% Conversion costs$7,700 20% A total of 8,400 units were started and 7,500 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 Materials costs$186,300 Conversion costs$329,800 The ending inventory was 70% complete with respect to materials and 60% complete with respect to conversion costs. The cost per equivalent unit for materials for the month in the first processing department is closest to: Multiple Choice $23.25 $21.96 $21.44 $20.25