Your parents will retire in 19 years. They currently have $318,412, and they think they will need $1,730,054 at retirement. Assuming they don't save any additional funds, the annual interest rate they must earn to achieve their goal would be _______%.

Do not round any intermediate work. Round your final answer to 2 decimal places (ex: if your answer is 3.45678%, then you should enter 3.46). Margin of error for correct answers: +/- .03.