Chae Corporation uses the weighted-average method in its process costing system. This month, the beginning inventory in the first processing department consisted of 640 units. The costs and percentage completion of these units in beginning inventory were: Cost Percent Complete Materials costs $7,300 80% Conversion costs $6,300 20% A total of 9,500 units were started and 8,200 units were transferred to the second processing department during the month. The following costs were incurred in the first processing department during the month: Materials costs $137,300 Conversion costs $323,300 The ending inventory was 80% 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: $14.83 $13.54 $14.08 $14.26