A coin that was featured in a famous novel sold at auction in 2014 for $2,429,000. The coin had a face value of $20 when it was issued in 1789 and had previously been sold for $275,000 in 1976. At what annual rate did the coin appreciate from its first minting to the 1976 sale? What annual rate did the 1976 buyer earn on his purchase? At what annual rate did the coin appreciate from its first minting to the 2014 sale?