Answer
${$4,027.50}$
$10.7\%$
$6.2\%$
Work Step by Step
From 3e, the total tax owed is ${$5,027.50}$, and subtracting ${$1,000}$ for the per-child tax credit, now the amount actually paid will be ${$4,027.50}$.
From part d, your taxable income is ${$37,500}$, so your average tax rate relative to your taxable income is
$\frac{$4,027.50}{$37,500}$ \approx 10.7%
Your average tax rate relative to your gross income is
$\frac{$4,027.50}{$65,000} \approx 6.2\%$
