well, if we take 43.89 to be the 100%, what is 9.66 off of it in percentage?
[tex]\bf \begin{array}{ccllll}
amount&\%\\
\text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\
43.89&100\\
9.66&x
\end{array}\implies \cfrac{43.89}{9.66}=\cfrac{100}{x}[/tex]
solve for "x".