When opening a door, you push on it perpendicularly with a force of 55.0 N

(a) When opening a door, you push on it perpendicularly with a force of 55.0 N at a distance of 0.850 m from the hinges. What torque are you exerting relative to the hinges?
(b) Does it matter if you push at the same height as the hinges? There is only one pair of hinges.