We remember that for calculating percentages, we take the percent as a fraction. And that it becomes a multiplication between the fraction and the number. For example, 15% represents:
[tex]15\%=\frac{15}{100}=\frac{3}{20}[/tex]When we simplify the last fraction.
In this exercise, we have to calculate the tip, which is the 20% of the total bill. As we see before, we just have to calculate the fraction and make the multiplication between that fraction and the bill value (58.74).
[tex]\begin{gathered} 20\%\text{ of 58.74}=\frac{20}{100}\cdot58.74 \\ =\frac{1}{5}\cdot58.74 \\ =\frac{58.74}{5} \\ =11.748 \end{gathered}[/tex]This means that the tip will be $11.748.