Assembly department of zahra technologies had 200 units as work in process at the beginning of the month. these units were 45% complete. it has 300 units which are 25% complete at the end of the month. during the month, it completed and transferred 600 units. direct materials are added at the beginning of production. conversion costs are allocated evenly throughout production. zahra uses weighted-average process-costing method. what is the number of equivalent units of work done during the month with regards to direct materials?