You are a professor of economics at a university.​ you've been offered the position of serving as department​ head, which comes with an annual salary that is ​$8 comma 5008,500 higher than your current salary.​ however, the position will require you to work 200 additional hours per year. suppose the next best use of your time is spending it with your​ family, which has value of ​$2020 per hour.