please show work in excel!

Nero Violins has the following capital structure: a. What is the firm's asset beta? (Hint: What is the beta of a portfolio of all the firm's securities?) (Do not round intermediate calculations. Round your answer to 3 decimal places.) b. Assume that the CAPM is correct. What discount rate should Nero set for investments that expand the scale of its operations without changing its asset beta? Assume a risk-free interest rate of 5% and a market risk premium of 6%. Ignore taxes. (Do not round Intermediate calculations. Enter your answer as a percent rounded to 2 decimal places.)