PAC Ltd is planning to issue zero coupon bonds with 20 years to maturity. The face value of the bond would be $800. The company is expected to pay coupons on the bonds at 16% annually and expects a net proceed of $220 from each bond. PAC Ltd currently has 24% tax rate. Using the approximation formula, estimate the before-tax cost of debt for PAC Ltd. Select one: a. 5.68% b. 0.3078% c. 30.78% d. 0.0563%