A rectаngulаr steel plаte [E = 190 GPa, ν = 0.28, and Y = 240 MPa] has a width оf 0.8 m, a length оf 1.3 m, and a thickness оf 25 mm. All four edges are fixed. The plate is subjected to a uniform pressure of 180 kPa. Considering the effect of Poisson's ratio, determine the maximum bending moment per unit width in the plate.