Please show me the detailed steps and explanation for this question. NOT using excel and professional financial calculators. Thank you so much!

Consider the following information about three stocks: Probability of State of Economy State of Economy Boom Normal Bust 0.35 0.50 0.15 Rate of Return if State Occurs Stock A Stock B Stock C 0.24 0.36 0.55 0.17 0.13 0.09 0.00 -0.28 -0.45 a) If your portfolio is invested 40 percent each in A and B and 20 percent in C, what is the portfolio expected return? The variance? The standard deviation? b) If the expected T-bill rate is 3.80 percent, what is the expected risk premium on the portfolio