I'm having trouble with picking the correct equations for this. Some ways equal 12.4 N-m, but that's wrong. 24.8 N-m is also wrong. I have 62sin60 and 62cos60, and the perpendicular should be 200mm.

The couple of the moment of the two forces is 3.82 N.m
We are given;
Force applied at A; F_a = 62 N
Force applied at C; F_c = 62 N
AB = BC = 200 mm = 0.2 m
Horizontal component of F_a is; F_ax = 62 cos 50
Vertical component of F_a is; F_ay = 62 sin 50
Horizontal component of F_c is; F_cx = 62 cos 50
Vertical component of F_c is; F_cy = 62 sin 50
Taking moments about point C gives;
M_c = F_ay * AB - F_ax * BC
M_c = (62 sin 50 * 0.2) - (62 cos 50 * 0.2)
M_c = 23.75 - 19.93
M_c = 3.82 N.m
Thus, the couple of the moment of the two forces is 3.82 N.m
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