Problem 12-15 Arithmetic and Geometric Returns (LO1) A stock has had returns of 11 percent, 18 percent, 20 percent, -13 percent, 25 percent, and -9 percent over the last six years. What are the arithmetic and geometric average returns for the stock? (Do not round intermediate calculations and enter your answers as a percent rounded to 2 decimal places, e.g., 32.16.) % Arithmetic average return Geometric average return %