A stock has the following returns over a three-year period: 26%,5%,13%. What is this stock's geometric average return over this three-year period? Enter your answer as a percent to two decimal places (e.g., 0.1250=12.50%). Full credit: within 0.02% of the correct answer (e.g, 12.48% - 12.52% ). Partial credit: within 0.10% of the correct answer (e.g,12.40%12.60%)