Early last year, the Mary Growth Fund ran advertisements in the financial pages of major newspapers. The "ad" had primarily empty space containing the simple message:

$20,000 INVESTED IN MARYINVESTMENT GROWTH FUND ON DECEMBER 31, 1972

WOULD BE WORTH $5.70 MILLION ON DECEMBER 31, 2020

What annual rate of return did the fund realize over the period ending December 31 last year if interest was compounded annually? Note: Please make sure your final answer(s) are in percentage form and are accurate to 2 decimal places. For example 34.56%