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 Tc=0.35. a. A$3,000, one-year loan at 6%. Note: Do not round intermediate calculations. Round your answer to 2 decimal places. b. A five-year loan of $3,000 at 6%. Assume no principal is repaid until maturity. Note: Do not round intermediate calculations. Round your answer to 2 decimal places. c. A$3,000 perpetuity at 5%