For the existing rectangular reinforcod concrete cross$-$sections shown,

Calculate tho maximum working stress steel and concrete stresses $(f_e$ and $f_3)$ for the applied working load $($unfactored$)$ bending moments given.

$M=120kNm$

$f_o=32$MPa

$M=80kNm$

$($iv$)$

$P_5=20$MPa

$M=15kNm$