A four-year project requires an investment of -168 and has the following cash flows in years 1 through 4, respectively (all cash flows in dollars): 115, 265, 165, and 190. Without actually calculating any IRR, what is the minimum 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%)