Answer
$\tau = 1.2~m\cdot N$ (clockwise)
Work Step by Step
We calculate the net torque through the formula:
$\tau = (\sum r\cdot F) - \tau_f$
$\tau = (0.24~m)(18~N) + (0.12~m)(35~N) - (0.24~m)(28~N) - 0.60~m\cdot N$
$\tau = 1.2~m\cdot N$ (clockwise)
