The answers are given, I just need to know how to get them.

You own a portfolio that has $600 invested in stock A and $1, 200 invested in stock B. If the expected returns on these stocks are 13 percent and 22 percent respectively, what is the expected return on the portfolio? E(R_p) = 19% A portfolio is invested 20 percent in stock G, 60 percent in stock J, and 20 percent in stock K. The expected returns on these stocks are 15 percent, 25 percent, and 35 percent, respectively. What is the portfolio's expected return? E(R_p) = 25% A stock has a beta of 1.2, the expected return on the market is 17%, and the risk-free rate is 8%. What must the expected return on this stock be? 18.8% A stock has an expected return of 17 percent, its beta is 0.9, and the risk-free rate is 7.5%. What must the expected return on the market be? 18.06%