Find the moment of the force about the point R.

6000Nm 7000Nm 5550Nm 5000Nm

5000Nm

As we know that the moment is the cross product of the distance and the force we will try to apply the same here. We see that the perpendicular distance is 5m. Thus we get the distance. And hence multiply it with the force, 5x2000xsin30. Because the force component perpendicular to the distance needs to be taken.