Before-tax cost of debt and after-tax cost of debt

David Abbot is buying a new house, and he is taking out a 30-year mortgage. David will borrow $206,000 from a bank, and to repay the loan he will make 360 monthly payments (principal and interest) of $1,180.01 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?

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Part 1

a. The before-tax interest rate (per year) on David's loan is enter your response here%. (Round to two decimal places.)

Part 2

b. The after-tax interest rate that David is paying is enter your response here%. (Round to two decimal places.)