The I-section can be divided into three rectangles.
Rectangle 1: $b_1 = 0.4 m$, $h_1 = 0.1 m$, $A_1 = 0.04 m^2$, $y_1 = 0.35 m$
Rectangle 2: $b_2 = 0.1 m$, $h_2 = 0.6 m$, $A_2 = 0.06 m^2$, $y_2 = 0 m$
Rectangle 3: $b_3 = 0.4 m$, $h_3 = 0.1 m$, $A_3 = 0.04 m^2$,
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