Calculating Resultants and Percent Error

[godkills]

Well I am almost done with my lab report finally and I just hit a speed bump. When I calculate my percent error something popped up in my calculator showing that I have like 80% error in the last 2 problems. Anyone know why am I getting this huge marginal error?

please note that

30 125 200 288 are the angles that are used in a circular stand to have a balance.

 

[godkills]

bump?