I need help with this question I can get the first part, but I cannot get the correct standard deviation.

a. Your portfolio is invested 30 percent each in A and C, and 40 percent in B. What is the expected return of the portfolio? (Do not round intermediate calculations. Enter your answer as a percent rounded to 2 decimal places. Omit the "\%" sign in your response.) Expected return % b- What is the variance of this portfolio? (Do not round intermediate calculations. 1. Round your answer to 5 decimal places.) b- What is the standard deviation? (Do not round intermediate calculations. Enter your 2. answer as a percent rounded to 2 decimal places.)