In a process with 860 units of beginning Work in Process, the company completed and transferred out 11500 units during a period. There were 5300 units in the ending Work in Process that were 60% complete as to conversion costs. Materials are added 70% at the beginning of the process and 20% 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?

14950 equivalent units

16800 equivalent units

13800 equivalent units

15210 equivalent units