Arlene is single and has taxable income of $$40,567.$ Her tax liability is currently $$4,636.$ She has the opportunity to earn an additional $$6,000$ this year. Her tax liability will grow to $$5,771$ if she receives the additional income. What is Arlene's marginal tax rate for the additional $$6,000?$

Multiple choice question.

$14\mathrm{.}99\%$

$15\%$

$25\%$

$18\mathrm{.}92\%$