A simply supported beam with a span of 8 meters is subjected to a counterclockwise moment at the left support and a clockwise moment at the right equal to 25% of the moment at the left support, both acting in the plane of the minor axis of the beam. The beam is not restrained against lateral buckling. The beam is A36 steel with yield strength Fy = 248 MPa. The beam is a W 21 by 62 steel shape with the following properties:

r = 0.053 m
d = 0.533 m
bf = 0.210 m
tf = 0.016 m
S = 0.002077 m^3

Compute the value of the allowable bending stress in the compression flange in MPa in accordance with NSCP 2015.