Toyota Motor Corporation uses process costing for its car manufacturing process, which involves two departments: Assembly and Paint. During September 2025, the Assembly Department incurs costs of $10 million and produces 20,000 units. The Paint Department incurs costs of $5 million and paints 15,000 units received from Assembly. At the beginning of the month, there were 2,000 units in the Assembly Department's beginning work in process inventory, and 3,000 units were in ending work in process inventory, 50% complete for materials and 30% complete for conversion costs.

Required:

• Calculate the equivalent units of production for materials and conversion costs in both Assembly and Paint departments.
• Determine the cost per equivalent unit for materials and conversion costs in each department.
• Allocate costs to completed units and units in ending work in process inventory using the weighted average method for each department.
• Prepare a cost summary report showing the total manufacturing costs incurred by Toyota Motor Corporation.
• Analyze the impact of using process costing with multiple departments on cost allocation.