Roger is a graphic artist, so his resum is several pages long and includes an artistic portfolio.

Roger is a graphic artist, so his resumé is several pages long and includes an artistic portfolio. His prospective employers want hard copies of his resumé, so he wants to have 400 copies of his resumé printed. His local print shop charges $91.50 for the first 200 copies and $420 for every 100 additional copies.
a. How much will the 400 copies cost, including a sales tax of 6%?
b. If the number of sets of 100 resumés is represented by x, express the cost of the resumés, r(x), as a piecewise function of x.