[tex]1\%{ = \frac{1}{100}[/tex]
[tex]\underline{\frac{3}{4} = \frac{3\cdot25}{4\cdot25} = \frac{75}{100} =75\%}\\\\\underline{\frac{19}{25}= \frac{19\cdot4}{25\cdot4} = \frac{76}{100} = 76\%}\\\\\underline{0,79 = \frac{79}{100} = 79\%}\\\\\underline{\frac{77}{99} = 0,(7)\approx0,78\cdot100\% \approx78\%}\\\\\underline{\frac{80}{101} \approx0,79\cdot100\%\approx79\%}[/tex]
