2. Your small business has just borrowed $500,000 from a bank. The coupon rate on the debt is 8%, the debt is perpetual, and your federal, state, and local corporate tax rate is 28.1%. a. Compute the annual interest tax shield on the bank loan. b. Compute the present value of the annual interest tax shield, assuming its risk is the same as the loan. c. Compute the present value of the tax shield if, just days after the loan is signed, the coupon rate on comparable bank loans drops to 6%