if we take 12450 to be the 100%, what is 622.50 off of it in percentage then? let's check.
[tex]\bf \begin{array}{ccll}
amount&\%\\
\text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\
12450&100\\
622.50&p
\end{array}\implies \cfrac{12450}{622.50}=\cfrac{100}{p}\implies p=\cfrac{622.50\cdot 100}{12450}[/tex]
