Calculate the displacement volume, delivery pulsation coefficient, input power leakage flow rate, resistance to internal leakage, and the driving torque of a gear pump with the following parameters:

Pump speed = 1450 rpm, number of teeth = 12
Gear module = 3.5 mm, gear width = 20 mm
Pressure angle = 20, inlet pressure = 0.2 MPa
Outlet pressure = 15 MPa, mechanical efficiency = 0.85
Volume efficiency = 0.9

If the pressure is increased to 220 bar, calculate the volumetric efficiency.