In order to calculate 80% of 685, first let's convert the percentage into its fraction form or decimal form.
Converting it to its fraction form, we have:
[tex]80\text{\%}=\frac{80}{100}[/tex]Then, we need to multiply the fraction by the value 685:
[tex]\frac{80}{100}\cdot685=\frac{8}{10}\cdot685=\frac{4}{5}\cdot685=\frac{2740}{5}=548[/tex]Therefore the result is 548.
If we use the decimal form of the percentage, the result is the same:
[tex]\begin{gathered} 80\text{\%}=0.8 \\ 0.8\cdot685=548 \end{gathered}[/tex]