Over the last four years, the common stock ot Plymouth Shippers has had an arithmetic verage return of 10.4 prcent. Three of those four years produiced return of 16.1 percent, 15.6 percent, and 9.4 percent respectively. What is the geometric average return for this four-year period? Seleccione una a. 10.22 percent 9.72 percent 38 percent d. 3 percent 10:41 percent