Compute the present value of interest tax shields generated by these three debt issues. Consider corporate taxes only. Assume that the marginal tax rate is T = 0.30. a. A $1,300, one-year loan at 10%. Note: Do not round intermediate calculations. Round your answer to 2 decimal places. b. A four-year loan of $1,300 at 10%. Assume no principal is repaid until maturity. Note: Do not round intermediate calculations. Round your answer to 2 decimal places. c. A $1,300 perpetuity at 9%. a. Present value b. Present value c. Present value