In a process with 860 units of beginning Work in Process inventory, the company completed and transferred out 11500 units during a period. There were 5300 units in the ending Work in Process inventory that were 60% complete as to conversion costs. Direct materials are added 70% at the beginning of the process and 30% when the units are 80% complete. How much is equivalent units of production for the period for material costs if the weighted average method is used? 13800 equivalent units of production 15210 equivalent units of production O 14950 equivalent units of production O 16800 equivalent units of production