Total and Unit Product Cost Martinez Manufacturing Inc. showed the following costs for last month: Direct materials $8,000 Direct labor 3,100 Manufacturing overhead 2,500 Selling expense 7,000 Last month, 5,000 units were produced and sold. Required: 1. Classify each of the costs as product cost or period cost. Direct materials Direct labor Manufacturing overhead Selling expense 2. What is the total product cost for last month