To lift the car, the pressure must be atleast same in both pistons.
Diameter of larger piston = 1m = 100cm
Radius of larger piston, R = 100/2 cm = 50cm
Area(A₁) = πR² = π×50² = 2500π cm²
Diameter of smaller piston = 10cm
Radius of smaller piston, r = 10/2 cm = 5cm
Area(A₂) = πR² = π×5² = 25π cm²
Car of weight W is on larger piston,
Let the force on smaller piston required to lift it = F
Since pressure on both pistons is same,Minimum force required is W/100.