Alaska Air Group, Inc., $($NYSE: ALK$),$ had a closing stock price on $11/25/2019$ of $$68\mathrm{.}79.$

On its most recent balance sheet, it has $$3,751$ million in shareholders$$ equity, $123\mathrm{.}17$

million shares outstanding, $$486$ million in current portion of long$-$term debt, and

$$1,617$ million in long$-$term debt. Alaska$$s beta is $0\mathrm{.}82($regression using $3$ years of

monthly returns$)$ and its marginal tax rate is $21\%.$ Alaska$$s credit rating was downgraded

to BBB$-$ after the Virgin America acquisition. The effective yield on the Bank of America

Merrill Lynch U$.$S$.$ Corporate BBB Index was $3\mathrm{.}26\%$ on $11/22/2019.$ Recent Treasury yield

information is provided in the table below:

Date $6$ Mo $1$ Yr $2$ Yr $3$ Yr $5$ Yr $7$ Yr $10$ Yr $20$ Yr $30$ Yr

$11/25/20191\mathrm{.}611\mathrm{.}581\mathrm{.}611\mathrm{.}601\mathrm{.}621\mathrm{.}711\mathrm{.}762\mathrm{.}072\mathrm{.}21$

What is Alaska Air Group$$s weighted average cost of capital? If you need to make some

assumptions, state them clearly