(Solving for ) In March 1963, Ironman was introduced in issue 39 of the comic book Tales of Suspense. The original price for that issue was $0.15. By March 2013, 50 years later, the value of this comic book, given the condition it's in, had risen to $10,000. What annual rate of interest would you have earned if you had bought the comic book in 1963 and sold it in 2013? The annual rate of interest you would have earned if you had bought the comic book in 1963 and sold it in 2013 is what %? (Round to two decimal places.)