The returns on the common stock of New Image Products are quite cyclical. In a boom economy, the stock is expected to return 20 percent in comparison to 12 percent in a normal economy and a negative 10 percent in a recessionary period. The probability of a recession is 15 percent while the probability of a boom is 25 percent. What is the standard deviation of the returns on this stock? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.)