Owners of a car rental company have determined that if they charge customers p dollars per day to rent a car, where 50 p 200, the number of cars n they rent per day can be modeled by the linear function n(p)=1000-5p. If they charge $50 per day or less, they will rent all their cars. If they charge $200 per day or more, they will not rent any cars. Assuming the owners plan to charge customers between $50 per day and $200 per day to rent a car, how much should they charge to maximize their revenue?