Walbin Corporation uses the weighted-average method in its process costing system. The beginning work in process inventory in a particular department consisted of 15,500 units, 100% complete with respect to materials cost and 20% complete with respect to conversion costs. The total cost in the beginning work in process inventory was $25,200. A total of 53,000 units were transferred out of the department during the month. The costs per equivalent unit were computed to be $1.6 for materials and $3.3 for conversion costs. The total cost of the units completed and transferred out of the department was:

a. $259,700
b. $254,180
c. $189,740
d. $225,380