The total cost of the meal is the sum of the $28.80 without tip and the 25% of that cost (multiply 28.80 by 0.25 to find the 25%):
[tex]\begin{gathered} \text{Total cost}=28.80+28.80(0.25) \\ \text{Total cost}=28.80+7.2 \\ \text{Total cost}=36 \end{gathered}[/tex]Then, the total cost is $36.00
