How do I calculate these to end up with the correct answer highlighted in Green?

If the risk-free rate is 1%, the expected return and beta of a manufacturing stock is 9% and 0.8, what is the expected market return according to the security market line? 12% 11% 9% 10% If the expected market return is 8%, the risk-free rate is 2.5%, and the beta of the stock of a debt collection company is -0.1, approximately what is the expected return of the stock? 3% 2% 4% 8% REPORT AN ERROR > If the expected market return is 8%, the expected return and beta of a healthcare stock is 8% and 1 respectively, what is the risk-free rate according to the capital asset pricing model? 1% 0% -1% 2%