Physics: Torque and static equilibrium

[Frantelle]

I don't like writing formulas on the computer, so i just scanned my attempt.

http://c.imagehost.org/view/0630/q.jpg

In my working out, i incorrectly use the mass of 21kg for the light, it's actually 21.5kg...but either way my working out is still incorrect.

Thanks in advance, Frantelle.

 

[Piamedes]

Look closely at the diagram, does the tension in the cable actually have a component in the y-direction?