Decline Inc. is trying to determine its cost of debt. The firm has a debt issue outstanding with $10$ years to maturity that is quoted at $105\mathrm{.}2$ percent of face value of $$1,000.$ The issue makes semiannual payments with $6\%$ coupon rate. What is the aftertax cost of debt if the tax rate is $21$ percent?

Group of answer choices

$407$ percent

$4\mathrm{.}92$ percent

$4\mathrm{.}30$ percent

$4\mathrm{.}20$ percent