Rob deposited some money into an investment account. The account earned j1=6.00% in the first year, j1=6.50% in the second year, and j1=7.69% in the third year. What annually compounded rate (11) must the account earn in the fourth year so that the average annual rate of return for the entire four years is 7.20%? Express your answer as a percentage to 2 decimal places but don't include the % sign in the answer box. Express your answer to 2 decimal places