Your retired client has accumulated investment and retirement assets totaling $3,612,000. Assume the client expects to live for another 27 years and that he assumes an annual inflation rate of 2.1 percent. To leave his heirs the future value of the $3,612,000 at the end of the 27 years, and maintain an inflation-adjusted lifestyle of $242,000 a year for all 27 years, the clients investments would have to earn an average of ______ percent a year for the entire 27 years.

Round the answer to two decimal places in percentage form.