so it went down from 25 to 18, so 25 - 18 = 7.
if we take 25 to be the 100%, what is 7 off of it in percentage?
[tex]\bf \begin{array}{ccll} amount&\%\\ \cline{1-2} 25&100\\ 7&x \end{array}\implies \cfrac{25}{7}=\cfrac{100}{x}\implies 25x=700 \\\\\\ x=\cfrac{700}{25}\implies x=28[/tex]
