dont really understand need some assistance

Consider the following information: o. Your portfolio is invested 30 percent each in A and C and 40 percent in B. What is the expected return of the portfolio? Note: Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16. b. What is the variance of this portfolio? Note: Do not round intermediate calculations and round your answer to 5 decimal places, e.g., 16161. c. What is the standard deviation of this portfolio? Note: Do not round intermediate colculations and enter your onswer as a percent rounded to 2 decimal places, e.g., 32.16. Answer is complete but not entirely correct