What are the arithmetic and geometric average returns for a stock with annual returns of 13 percent, 9 percent, -3 percent, and 15 percent? List the arithmetic answer first. 9.90 percent, 8.50 percent 8.27 percent; 8.50 percent 8.50 percent; 9.90 percent 9.90 percent, 8.27 percent 8.50 percent; 8.27 percent