please help

Assume the following WIP, beginning 1,500 units ( 100% complete as to direct materials, 40% complete as to conversion costs) Started 9,500 units during the period Total spoilage is 400 with normal spoilage is calculated to be 350 units Completed and transferred out during the period 6,000 units WIP, ending 4,600 units ( 100% complete as to direct materials, 50% complete as to conversion costs) Spoiled units 400 and inspection happens when the process is 20% complete All materials are added at the start of the process Under the weighted average method, what would be the equivalent units of work done for the period for conversion costs? A. 6,000 B. 8,380 C. 6.970 D. 4,600