5. (5 points). Sequoia Manufacturing Inc. uses a weighted-average process cost system to account for the cost of producing a PVC (Polyvinyl Chloride) compound. As part of the production, a type of oil (Oil-XYZ) is added when the goods are 55% complete. Beginning work-in-process inventory for the current month was 2,000 units, 70% complete. During the month, 8,000 units were started in process, and 7,500 units were completed. There were no lost or spoiled units. If the ending inventory was 40% complete, the total equivalent units for Oil-XYZ for the month were: a. 2,500 b. 10,000 c. 7,500 d. 8,500 e. None of the answer is correct. Explain your