280° is the same as -80°. The horizontal resultant is 200cos60+85cos80=114.7601N approx.
The vertical resultant is 200sin60-85sin80=89.4964N approx. The resultant force is √114.7601^2+89.4964^2=145.5317N approx. The angle is arctan(114.7601/145.5317)=52.05° approx.