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 $7,500 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 $10 per hour.

The change in net benefit is $___