Classifying Costs The following is a list of costs incurred by several businesses: Classify each of the following costs as product costs or period costs. Indicate whether each product cost is a direct materials cost, a direct labor cost, or a factory overhead cost. Indicate whether each period cost is a selling expense or an administrative expense. Costs a. Cost of fabric used by clothing manufacturer b. Maintenance and repair costs for factory equipment c. Rent for a warehouse used to store raw materials and work in process d. Wages of production quality control personnel e. Oil lubricants for factory plant and equipment