well, let's say is "x", so "x" is the 100%, now if 84 is the 24%, what is "x"?
[tex]\bf \begin{array}{ccllll}
amount&\%\\
\text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\
84&24\\
x&100
\end{array}\implies \cfrac{84}{x}=\cfrac{24}{100}[/tex]
solve for "x".
