The total amount jamal paid is $305.
Given:
Jamal treated his family with a family brunch at the cost of $250.
The sales tax was 4%.
The tip is 18%.
to find the sales tax.
[tex]\begin{gathered} =250\cdot4\text{ \%} \\ =250\cdot\frac{4}{100} \\ =\frac{1000}{100} \\ =10 \end{gathered}[/tex]The amount he paid for sales tax is $ 10.
to find the tip.
[tex]\begin{gathered} =250\cdot18\text{ \%} \\ =250\cdot\frac{18}{100} \\ =\frac{4500}{100} \\ =45 \end{gathered}[/tex]Jamal left a tip of $45.
Thus the total amount paid by Jamal is,
[tex]250+10+45=305[/tex]