Two persons are trying to use a revolving door as in shown if Figure bellow. The door has a diameter of 2.0 m. The person on the left exerts a force of 400 N perpendicular to the door and 0.6m from the hub’s center, while the one on the right exerts a force 600 N perpendicular to the door and 0.2 m from the hub’s center. Find the net torque on the revolving door.
A. 240 N
B.-120 N
C.120 N
D. 360N