SITUATION $02-$ A T$-$beam has the following properties: $bf=820mm,bw=250mm,d=470mm,t=100mm.$ Concrete compressive strength $f{c}^{\text{'}}=20\mathrm{.}7$MPa and steel yield strength $fy=414$MPa. Use reduction factor of $0\mathrm{.}90$

$4.$ What is the required steel area if $M_D=150KN-m$ and $M_L=120KN-m?$

a$.2283m{m}^2$

b$.2300m{m}^2$

c$.3485m{m}^2$

d$.1303m{m}^2/$

$5.$ What is the required steel area if $M_D=195KN-m$ and $M_L=230KN-m?$

a$.3276m{m}^2$

b$.3919m{m}^2$

c$.3485m{m}^2$

d$.1303m{m}^2$