Adamson Corporation is considering four average$-$risk projects with the following costs and rates of return:

The company estimates that it can issue debt at a rate of $r_d=10\%,$ and its tax rate is $25\%.$ It can issue preferred stock that pays a constant dividend of $$5\mathrm{.}00$ per year at $$56\mathrm{.}00$ per share. Also, its

common stock currently sells for $$47\mathrm{.}00$ per share; the next expected dividend, $D_1,$ is $$5\mathrm{.}75$; and the dividend is expected to grow at a constant rate of $5\%$ per year. The target capital structure consists of

$75\%$ common stock, $15\%$ debt, and $10\%$ preferred stock.

a$.$ What is the cost of each of the capital components? Do not round intermediate calculations. Round your answers to two decimal places.

Cost of debt: $,\%$

Cost of preferred stock: $,\%$

Cost of retained earnings:

$\%$

b$.$ What is Adamson's WACC? Do not round intermediate calculations. Round your answer to two decimal places.

$\%$

c$.$ Only projects with expected returns that exceed WACC will be accepted. Which projects should Adamson accept?