A portfolio is composed of two stocks, A and B. Each stock has an expected return of 15%. For Stock A, the standard deviation of the rate of return is 20%. For Stock B, the standard deviation of the rate of return is 30%. Stock A comprises 40% of the portfolio while Stock B comprises 60% of the portfolio. What is the standard deviation of return for the portfolio if the correlation coefficient between the returns for A and B is 0.5?

		5.3%
		23.1%
		27.4%
		45.4%