Assembly department of Zahra Technologies had 100 units as work in process at the beginning of the month. These units were so complete. It has 200 units which are 25% complete at the end of the month. During the month, it completed and transferred 500 units. Direct materials are added at the beginning of production. Conversion costs are allocated evenly throughout production. Zahra uses weighted average process costing method Calculate the total equivalent units in ending inventory for assignment of conversion costs? O a. 150 units b. 200 units OC. 50 units O d. 25 units