Assuming that the total value is in cell A2 and percent in B2, the above formula turns into a simple =A2*B2 and returns 104.50. Remember, when you type a number followed by the percent sign (%) in Excel, the number is interpreted as a hundredth of its value. For example, 11% is actually stored as 0.11 and Excel uses this underlying value in all formulas and calculations. In other words, the formula =A2*11% is equivalent to =A2*0.11.
from my understanding, shut off pressure is the the higest pressure that can be produced by a pump and this happened at zero flow i.e. control valve closed at discharge line. so when pump running during discharge valve closed, the pressure build up in the pipe line until a maximum pressure and this maximum pressure is shut off pressure.
The Flotec Pressure Switch is designed for use with submersible well pumps or as a replacement switch. The switch features a low-pressure cut-off for safety. For use with water-supply systems. For use with submersible well pumps or as a replacement switch. Turns on at 30 psi and off at 50 psi. Adjustable up to 40/60 psi or down to 20/40 psi. Includes low-pressure safety cutoff to shut off the pump when the system pressure drops to 10 psi.