SOLUTION
A tip of $5 for a total bill of $40 to percentage is
[tex]\begin{gathered} \frac{5\text{ dollars}}{40\text{ dollars}}\times\frac{100}{1} \\ \frac{5}{40}\times100 \\ =\frac{1}{8}\times100 \\ =\frac{100}{8} \\ =12.5\% \end{gathered}[/tex]Hence the answer is 12.5%
