15.5) A uniform horizontal lever of length 6.0 m is pivoted at its mid-point. The following forces are acting on the lever: a 0.53 N vertically downward force acting at the right end of the lever, a 4 N vertically downward force acting at the left end of the lever, and a 5 N vertically downward force acting at a point on the lever 0.5 m away from the left end. Calculate the net torque acting on the lever.
The correct answer is 22.91 N m, but I need to know how to get there (formulas used, each step taken). Thank you!