A rectangular section of width 200 mm and a total depth of 400 mm is used in simply supported steel beam having yield strength fy = 250 MPa. The section is stress up to its yield value up to one-third of its total depth from the top and bottom fibers under the action of certain moment M. The stress distribution for the remaining depth is assumed to be linear. What would be that moment M (in kN-m, up to two decimal places)?
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