Assume the total cost of a college education will be $400,000 when your child enters college in 17 years. You presently have $66,000 to invest. What annual rate of interest must you earn on your investment to cover the cost of your child's college education? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.) Annual rate % Assume that in 2018, a copper penny struck at the Philadelphia mint in 1793 was sold for $255,000. What was the rate of return on this investment? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.) Rate of return %