An asset has had an arithmetic return of 10.8 percent and a geometric return of 8.8 percent over the last 86 years. What return would you estimate for this asset over the next 7 years? 21 years? 28 years? (Do not round intermediate calculations. Enter your answers as a percent rounded to 2 decimal places, e.g., 32.16.) Future annual returns 7 years % 21 years % 28 years %