Williams Performance Co. manufactures sports cars. After making a sale, the salesperson sends the car to be detailed before the customer takes it home. Detailing the car takes 15 minutes at a cost of $15 per hour for direct labor and $5 per car for materials. If the average salesperson sells six cars per day, what is the average cost per 5-day week for detailing cars? (Do not round intermediate calculations. Round your final answer to 2 decimal places.)