From the question, if we find the ration of the value given,
[tex]\frac{5}{45}=\frac{1}{9}[/tex]
It shows 1h : $9
So for every 1h, it is equivalent to $9
[tex]\frac{1\times4}{9\times4}=\frac{4}{36}[/tex]
Hence, option A is the correct option (4h/$36).
