The following information concerns equivalent units in September for Processing Department A for a company that uses process costing: Units Beginning Work-in-Process Inventory (50 percent complete) 2,000 Units started during September 11,800 Units completed and transferred 10,900 Ending Work-in-Process Inventory (70 percent complete) 2,900 What are the equivalent units for September when using the weighted average costing method? 22,900 13,800 12,930 11,800