(Solving for r in compound interest-financial calculator needed) In September 1963 , the first issue of the comic book X-MEN was issued. The original price for that issue was $0.15. By September 2020,57 years later, the value of the near-mint copy of this comic book had risen to $55,900. What annual rate of interest would you have earned if you had bought the comic in 1963 and sold it in 2020 ? The annual rate of interest you would have earned is \%. (Round to two decimal places.)