Question

Paul works for a company that deals in paints and dyes. He is paid a fixed monthly salary plus 15 percent commission on monthly sales over $20,000 If Paul manages to achieve total monthly sales of $x, which is over $20,000, the function f(x) representing Paul's monthly sales over $20,000 is given by a. x-20,000 b. x+20,000 c. 20,000-x d. 20,000/x