[tex]1\%=\frac{1}{100}\\\\21\%=21*\frac{1}{100}=\frac{21}{100} \\\\ 0,5\%=0,5*\frac{1}{100}=\frac{\not{5}^1}{\not{100}^{20}}*\frac{1}{100}=\frac{1}{2000} \\\\45\%=\not{45}^9*\frac{1}{\not{100}^{20}}=\frac{9}{20}[/tex]
