Kathleen Murray’s taxable income for 2017 is $45,000 which is within the tax income bracket of $37.950 to $91,900. Tax rate is 25%, and tax owed is $5,226.25 plus 25% of the excess over $37,950.
$45,000 - $37,950 = $7,050, excess over $37,950
Tax owed = $5,226.25 + 0.25 x $7,050
Tax owed = $6,988.75