from 0.40 to 7.25 is 7.25 - 0.40 or 6.85.
now, if we make 0.40 to be the 100%, what is 6.85 off of it in percentage?
[tex]\bf \begin{array}{ccll}
amount&\%\\
\text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\
0.40&100\\
6.85&p
\end{array}\implies \cfrac{0.40}{6.85}=\cfrac{100}{p}\implies p=\cfrac{6.85\cdot 100}{0.40}[/tex]