Need some help here. I did the video walk through but still a bit lost. Can someone walk me through this?

a. What is the cost of each of the capital components? Do not round intermediate calculations. Round your answers to two decimal places. Cost of debt: % Cost of preferred stock: % Cost of retained earnings: % b. What is Adamson's WACC? Do not round intermediate calculations. Round your answer to two decimal places. % c. Only projects with expected returns that exceed WACC will be accepted. Which projects should Adamson accept