The steel and aluminum plate assembly is bolted together and fastened to the wall. Each plate has a constant width in the z direction of 200 mm and thickness of 20 mm. If the density of A and B is ρ_s = 7.85 Mg/m³, and for C,  ρ_al = 20.71 Mg/m³, determine the location of the center of mass. Neglect the size of the bolts.

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y A B 100 mm 300 mm -200 mm- C X