A five-year project requires an investment of -289 and has the following cash flows in years 1 through 5, respectively (all cash flows in dollars): 159, -134, 280, -5, and 117. Without actually calculating any IRR, what is the maximum possible value any of the real IRRs could have? Give your answer as a percent with two decimals; e.g., 23.24 (Acceptable error = 0.5%)