#### Answer

$\frac{4}{5}$, 80%

#### Work Step by Step

We are given the decimal .8.
To write .8 as a percentage, we must multiply by 100 and attach a percent sign to the end.
$.8=(.8\times100)$%=80%
80%=$80\div100=\frac{80}{100}=\frac{80\div20}{100\div20}=\frac{4}{5}$
Therefore, $\frac{4}{5}=.8$=80%