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High school Yr 12 aeronautical Engineering Module - mechanics

PLease help- i seem to get the incorrect answer but didn't know where i have gone wrong?
Problem: If each wing is to be 4.8m long and the lift force acts at 45% of the distance from the wing root, what will be the bending moment if the lift force is 9KN? What will be the bending stress if (Ixx = 1.8*10 power6 metres to the 10 power4, y = 20mm)