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 1 206.09 $ 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 32% 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?