If the question is: RM Inc. has a marginal tax rate of 35%.It can issue 10-year bonds with an annual coupon rate of 7% and a par value of $1,000.New bonds will net the company $966 in proceeds.Determine the appropriate after-tax cost of debt for the firm to use in its capital budgeting analysis. Is the answer 4.87% or 5.46%? I also tried an online calculator and it gave me a completely different answer of 4.55%. How should calculate this problem properly?