kindly solve all the question to simple understanding.. the topic is risk and return

Consider the following information about three stocks: a. If your portfolio is invested 70 percent in A and 30 percent in B, what is the portfolio expected return? The variance? The standard deviation? Page 6 of 33 b. If the expected T-bill rate is 3.80 percent, what is the expected risk premium on the portfolio? c. If the expected inflation rate is 3.50 percent, what are the approximate and exact expected real retums on the portfolio? What are the approximate and exact expected real risk premiums on the portfolio