A portfolio is composed of two stocks, A and B. Stock A has an expected return of 27% and a standard deviation of return of 23%, while stock B has an expected return of 17% and a standard deviation of return of 13%. The correlation coefficient between the returns on A and B is -0.22. Stock A comprises 42% of the portfolio, while stock B comprises 58% of the portfolio. What is the standard deviation of the return on this portfolio? Submit your answer in percentages, rounding up to the first two decimal points (in XX.XX format)