does anybody knows how to do it?

Rate of Return if State Occurs State of Economy Boom Normal Bust Probability of State of Economy 20 .55 .25 Stock A 38 .16 .00 suck B .50 14 -30 Stock C .50 .12 -50 ok + nces a-1. If your portfolio is invested 30 percent each in A and B and 40 percent in C, what is the portfolio expected return? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g.. 32.16.) a-2. What is the variance? (Do not round intermediate calculations and round your answer to 5 decimal places, e.g...16161.) a-3. What is the standard deviation? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.) b. If the expected T-bill rate is 3.60 percent, what is the expected risk premium on the portfolio? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.) C-1. If the expected inflation rate is 3.20 percent, what are the approximate and exact expected real returns on the portfolio? (Do not round Intermediate calculations and enter your answers as a percent rounded to 2 decimal places, e.g. 32.16.) C-2. What are the approximate and exact expected real risk premiums on the portfolio? (Do not round intermediate calculations and enter your answers as a percent rounded to 2 decimal places, e.g., 32.16.)