Determine the location $\frac{?}{\text{b}\text{a}\text{r}}(y)$ of the centroidal axis $\stackrel{}{x}-\stackrel{}{x}$ of the beam's cross$-$sectional area. Neglect the size of the corner welds at A and $B$ for the calculation. Take $r=36mm.$

$($Figure $1)$

Express your answer to three significant figures and include the appropriate units.

$\frac{?}{\text{b}\text{a}\text{r}}(y)=$

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