I need help solving the following:

A coin that was featured in a famous novel sold at auction in 2014 for $3, 987, 500. The coin had a face value of $15 when it was issued in 1785 and had previously been sold for $290,000 in 1969. At what annual rate did the coin appreciate from its first minting to the 1969 sale? (Do not round intermediate calculations. Enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.) Rate of return % What annual rate did the 1969 buyer earn on his purchase? (Do not round intermediate calculations. Enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.) Rate of return % At what annual rate did the coin appreciate from its first minting to the 2014 sale? (Do not round intermediate calculations. Enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.) Rate of return %