b$)$ Determine whether the beam would fail in the

steel$-$controlled mode or the concrete$-$controlled

mode.

Given:

$f_c^{\text{'}}=30$MPa

$f_y=400$MPa

${}_c=0\mathrm{.}65$

${}_s=0\mathrm{.}85$

$E_s=200000$MPa