$($Individual or component costs of capital$)$Compute the cost of capital for the firm for the following:

a$.$A bond that has a $$1,000$ par value $($face value$)$ and a contract or coupon interest rate of $11\mathrm{.}4$ percent. Interest payments are $$57\mathrm{.}00$ and are paid semiannually. The bonds have a current market value of $$1,128$ and will mature in $10$ years. The firm's marginal tax rate is $34$ percent.

b$.$A new common stock issue that paid a $$1\mathrm{.}87$ dividend last year. The firm's dividends are expected to continue to grow at $7\mathrm{.}3$ percent per year, forever. The price of the firm's common stock is now $$27\mathrm{.}85.$

c$.$A preferred stock that sells for $$145,$ pays a dividend of $9\mathrm{.}2$ percent, and has a $$100$ par value.$$

d$.$A bond selling to yield $11\mathrm{.}8$ percent where the firm's tax rate is $34$ percent.

a$.$The after$-$tax cost of debt is $\%.($Round to two decimal places.$)$