Given the increasing number of on-line banks, many high street banks are losing customers because they cannot match the interest rates offered on-line. For example, MainStreet Bank pays 8.1 percent simple interest on its investment accounts, while OnLine Bank pays interest compounded annually on its investment accounts. For HighStreet Bank to be competitive, they need to set a rate that matches the rate offered by OnLine Bank. What rate should HighStreet Bank offer to be equal to the rate offered by OnLine Bank over an investment horizon of 9 years? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.)