To solve the exercise, we can use a rule of three:
[tex]\begin{gathered} 0.5\text{\%}\rightarrow0.8 \\ 100\text{\%}\leftarrow x \end{gathered}[/tex][tex]\begin{gathered} x=\frac{100\text{\%}\cdot0.8}{0.5\text{\%}} \\ x=\frac{100\cdot0.8}{0.5} \\ x=\frac{80}{0.5} \\ x=160 \end{gathered}[/tex]Therefore, 0.8 is 0.5% of 160.
