Marigold Express reports the following costs and expenses in June 2017 for its delivery service. Indirect materials $6,030 Drivers' salaries $15,040 Depreciation on delivery equipment 10,500 Advertising 4,380 Dispatcher's salary 4,700 Delivery equipment repairs 282 Property taxes on office building 840 Office supplies 611 CEO's salary 11,280 Office utilities 940 Gas and oil for delivery trucks 2,040 Repairs on office equipment 178 Determine the total amount of (a) delivery service (product) costs and (b) period costs. (a) Delivery service (product) costs $ (b) Period costs $