Question

The population of a town was 25009 people then 3200 people moved away what was the percent of decrease

Answer 1

if we take 25009 to be the 100%, what is 3200 off of it in percentage?

$\bf \begin{array}{ccll}amount&\%\\\cline{1-2}25009&100\\3200&x\end{array}\implies \cfrac{25009}{3200}=\cfrac{100}{x}\implies x=\cfrac{3200\cdot 100}{25009}\implies x\approx 12.7954$