Answer :

[tex]80\%\cdot717=0.8\cdot717=573.6[/tex]
[tex]p\%=\frac{p}{100}\\\\80\%=\frac{80}{100}=\frac{8}{10}=0.8\\\\80\%\ of\ 717\ is\ equal\ 0.8\times717=\boxed{573.6}[/tex]