Jim Paige is opening his own restaurant, and he is taking out a 10-year mortgage. Jim will borrow $400,000 from a bank, and to repay the loan he will make 120 monthly payments (principal and interest) of $4,420.82 per month over the next 10 years. Jim is in the 30% tax bracket.

a. What is the before-tax interest rate (per year) on Jim’s loan?

b. What is the after-tax interest rate that Jim is paying?