A coin that was featured in a famous novel sold at auction in 2014 for $3,450,500. The coin had a face value of $1 when it was issued in 1792 and had previously been sold for $385,000 in 1973. At what annual rate did the coin appreciate from its first minting to the 1973 sale? (Do not round intermediate calculations. Enter your answer as a percent rounded to 2 decimal places.

- What annual rate did the 1973 buyer earn on his purchase? (Show working as well please) Thanks