28. Before-tax cost of debt and after-tax cost of debtDavid Abbot is buying a new house, and he is taking out a 30-year mortgage. David will borrow $205,000 from a bank, and to repay the loan he will make 360 monthly payments (principal and interest) of $1,155.75 per month over the next 30 years. David can deduct interest payments on his mortgage from his taxable income, and based on his income, David is in the 30% tax bracket. a. What is the before-tax interest rate (per year) on David's loan? b. What is the after-tax interest rate that David is paying?

a. The before-tax interest rate (per year) on David's loan is ___%. (Round to two decimal places.) b. The after-tax interest rate that David is paying is ___%. (Round to two decimal places.)