A horizontal essentially weightless lever is pivoted at its center so it can rotate freely in a vertical plane. A downward force of 80.0 N is applied perpendicularly to the lever at a point 35.0 cm from and to the right of the pivot. Another downward force of 100.0 N is applied perpendicularly to the lever at a point 15.0 cm from and to the left of the pivot. Determine the net torque on the lever.