The outstanding debt of Berstin Corp. has eight years to maturity, a current yield of $7\%,$ and a price of $$85.$ What is the pretax cost of debt if the tax rate is $25\%?$

A$.5\mathrm{.}1\%$

B$.8\mathrm{.}5\%$

C$.6\%$

D$.$ more information needed