Answer
See below:
Work Step by Step
(a)
Compute the amount of tax paid as shown below:
$\begin{align}
& \text{Tax paid}=\text{Tax rate}\times \text{Purchase price} \\
& =0.06\times \$24\\&=\$1.44\end{align}$
(b)
Compute the total cost of backpack as shown below:
\[\begin{align}
& \text{Total cost of Backpack}=\text{Purchase price}+\text{Tax paid} \\
& =\$24+\$1.44\\&=\$25.44\end{align}\]
