4725 - 2250, the increase is 2475.
now if we take 2250 to be the 100%, what is 2475 off of it in percentage?
[tex]\bf \begin{array}{ccll}
amount&\%\\
\text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\
2250&100\\
2475&p
\end{array}\implies \cfrac{2250}{2475}=\cfrac{100}{p}\implies p=\cfrac{2475\cdot 100}{2250}[/tex]
