Exavior Inc, has a bond outstanding with $20$ years to maturity, a $$1,000$ par value, a coupon rate of $8\%,$ with coupons paid semiannually, and a price of $$925.$ The company's tax rate is $40\%.$ What is the company's after$-$tax cost of debt?

$$ a$.0\mathrm{.}0264$

b$.0\mathrm{.}0528$

c$.0\mathrm{.}1041$

d$.0\mathrm{.}1557$