In 18 years, you are hoping to have saved $50,000 toward your child's education. If you are able to save $2,500 at the end of each year for the next 18 years, what rate of return must you earn on your investments in order to achieve your goal? Your answer should be an annual percentage rate in %. Round to two decimals (example: 10.15% should be entered as 10.15 with no additional symbols)