The cross-section consists of three rectangular parts:
1. Top flange: 200 mm x 20 mm
2. Web: 10 mm x (300 mm - 20 mm - 20 mm) = 10 mm x 260 mm
3. Bottom flange: 200 mm x 20 mm
First, find the centroid of the entire cross-section. Due to symmetry, the centroid is
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