the force acted on the beam after 3 metres, therefore BM is 8x3 = 24KNm. Therefore, compresive stress = 24000x0.096/102x10^-6 = 22588235Pa = 22.6 MPa. That was my answer, can u tell me how it's wrong
EDIT: argg, i forgot it was 4x3 = 12KNm, dammit should have made a diagram -.- you're right