Get the difference of the pressure in hydraulic line.
[tex]75\text{ psi}-40\text{ psi}=35\text{ psi}[/tex]Next, divide the difference from the original psi, and multiply by 100%
[tex]\begin{gathered} 35\text{ psi}\div40\text{ psi}=0.875 \\ 0.875\times100\%=87.5\% \end{gathered}[/tex]Therefore, the increase in pressure is 87.5%.
