The Richmond Corporation uses the weighted-average method in its process costing system. The company has only a single processing department. The company's ending work in process inventory on August 31 consisted of 21,200 units. The units in the ending work in process inventory were 100% complete with respect to materials and 60% complete with respect to labor and overhead. If the cost per equivalent unit for August was $3.55 for materials and $5.05 for labor and overhead, the total cost assigned to the ending work in process inventory was:

A) $182,320
B) $109,392
C) $118,084
D) $139,496

To calculate the total cost assigned to the ending work in process inventory, we need to first calculate the equivalent units of production for each cost component.

Materials:
Equivalent units of production = Units in ending WIP inventory x % completion
= 21,200 x 100%
= 21,200

Cost per equivalent unit for materials = $3.55

Total cost assigned to materials in ending WIP inventory = Equivalent units of production x Cost per equivalent unit
= 21,200 x $3.55
= $75,260

Labor and overhead:
Equivalent units of production = Units in ending WIP inventory x % completion
= 21,200 x 60%
= 12,720

Cost per equivalent unit for labor and overhead = $5.05

Total cost assigned to labor and overhead in ending WIP inventory = Equivalent units of production x Cost per equivalent unit
= 12,720 x $5.05
= $64,236

Total cost assigned to ending WIP inventory = Cost of materials + Cost of labor and overhead
= $75,260 + $64,236
= $139,496

Therefore, the correct answer is D) $139,496.