Information concerning the materials used in the Blending Department in November is as follows: Units Materials Costs Work in Process, November 1 3,200 $13,200 Units started during November 8,400 37,400 Units completed and transferred to next department during November 9,200 Work in Process, November 30 2,400 If the ending work-in-process inventory is 75% complete, using the average cost method, what was the materials cost in Work in Process at November 30? A. $7,852 B. $8,280 C. $6,120 D. $7,317