\[0,45 = \frac{45}{100} \Longrightarrow 45\%;\ \ \ \ \ \]
\[0,8 = \frac{8}{10} = \frac{80}{100} \Longrightarrow 80\%;\ \ \ \]
\[0,05 = \frac{5}{100} \Longrightarrow 5\%.\]