Over the last four years, a stock has had an arithmetic average return of 12.8 percent. Three of those four years produced returns of 22.6 percent, 15.2 percent, and 24.1 percent, respectively. What is the geometric average return for this four-year period?

• 12.67 percent

• 8.39 percent

• 10.18 percent

• 12.40 percent

• 11.67 percent