I want to be earning an annual salary of $100,000 when I retire in 21 years. I have been offered a job that guarantees an annual salary increase of...

I want to be earning an annual salary of $100,000 when I retire in 21 years. I have been offered a job that guarantees an annual salary increase of 4% per year, and the starting salary is negotiable. What is the lowest salary that I should request in order to meet my goal?