equivalent units of production.

I got majority of this problem, correct, I just need to know how to solve the last two problems with the ex's.

Equivalent Units of Production The Converting Department of Worley Company had 600 units in work in process at the beginning of the period, which were 75% complete. During the period, 12,400 units were completed and transferred to the Packing Department. There were 680 units in process at the end of the period, which were 70% complete. Direct materials are placed into the process at the beginning of production. Determine the number of equivalent units of production with respect to direct materials and conversion costs. If an amount is zero, enter in "0". Worley Company Number of Equivalent Units of Production Feedback * Check My Work When are the materials added to the units? How much more needs to be done to the beginning units with respect to conversion costs to complete the units? How much has been added to the units in ending work in process inventory with respect to materials and conversion