A rack is made from roll$-$formed sheet steel and has the cross section. The dimensions are indicated at the center thickness of each segment. Suppose that $L_1=60mm$ and $L_2=90\mathrm{.}0mm.($Figure $1)$

Part A

Determine the location $(\stackrel{}{x}\frac{,}{b}ar(y))$ of the centroid of the cross section.

Express your answers using three significant figures separated by a comma.

$\stackrel{}{x}\frac{,}{b}ar(y)=$

$$

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