A portfolio is composed of two stocks, A and B. Stock A has a standard deviation of return of 15%, while stock B has a standard deviation of return of 17%. The correlation coefficient between the returns on A and B is 1.Stock A comprises 75% of the portfolio, while stock B comprises 25% of the portfolio. The standard deviation of the return on this portfolio is _________. Note: Express your answers in strictly numerical terms.For example, if the answer is 5%, write 0.05