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7. 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 = 0.30. A. A $2,500, one-year loan at 6%. B. A five-year loan of $2,500 at 6%. Assume no principal is repaid until maturity. C. A $2,500 perpetuity at 5%