Mostly need help with finding tge the centroid and first moments of areas. The answers: Max bending stress $=30\mathrm{.}2$MPa. Corresponding shear stresses in the flange $=0\mathrm{.}53$MPa, At the flange web junction $=5\mathrm{.}29$MPa, in the web above neutral plane $=5\mathrm{.}80$ MPa, On the neutral plane $=5\mathrm{.}97$MPa