Answer :
[tex]\bf \begin{array}{ccll}
\${data-answer}amp;hours\\
\text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\
81.50&1\\
x&2.5
\end{array}\implies \cfrac{81.50}{x}=\cfrac{1}{2.5}\implies \cfrac{81.50\cdot 2.5}{1}=x[/tex]