The Brasher doubloon, which was featured in the plot of the Raymond Chandler novel, The High Window, was sold at auction in 2018 for a reported $5,000,000 million. The coin had a face value of $15 when it was first issued in 1787 and had been previously sold for $430,000 in 1979.

a) How much does the coin worth in 2022 (the future value in 2022) if it appreciate at the annual rate from its minting to the 1979 sale?

b) How much does the coin worth in 2022 if it appreciate at the annual rate from 1979 until 2018?

c) How much does the coin worth in 2022 if it appreciate at the annual rate from its minting to the 2018 sale?