Please show all calculations, thanks!

has In 1975, my father bought a set of original Lord of the Rings Trilogy books, signed by the author. J.R.R.Tolkien, for $375.00. He now given them to me. I have checked the current auction price and they sell for $22,500- lf the books continue to grow in value at the same rate, what price can I get for them twenty years from now (2038)? $47,922.45 $173,669.40 $203,014.92 $151,087.87 $73,669.40