Calculating future annual returns

An asset has had an arithmetic return of 11.9 percent and a geometric return of 9.9 percent over the last 86 years. What return would you estimate for this asset over the next 8 years? 23 years? 39 years? (Do not round intermediate calculations. Enter your answers as a percent rounded to 2 decimal places, e.g., 32.16.) Future annual returns 8 years % 23 years % 39 years %