An investor invests 75,000 in Stock A and 25,000 in stock B. Stock A has an expected return of 15% and a standard deviation of return of 18%. Stock B has an expected return of 5% and a standard deviation of return of 7%. What is the expected rate of return of his portfolio? 15.5% O 12.5% 9.5% 87.5% Question 20 4 pts