Situation $3$: A rectangular reinforced concrete beam having a simple span of $4\mathrm{.}5m$ carries a service dead load of $20k\frac{N}{m}$ and a

service live load of $35k\frac{N}{m}.$ Steel covering is $75mm$ measured from the centroid of the tension steel. Concrete strength f$\text{'}$c $=28$

MPa and steel yield strength is $415$MPa.

Use Combination load factor of $1\mathrm{.}4$DL $+1\mathrm{.}7$ LL

Determine the maximum moment due to factored loads?

$139\mathrm{.}22kNm$

$221\mathrm{.}48kNm$

$202\mathrm{.}50kNm$

$170\mathrm{.}30kNm$

Which of the following will be the economical dimension of the beam using the maximum allowable reinforcement area

using $=0\mathrm{.}9?$

$225mm475mm$

$200mm450mm$

$200mm475mm$

$300mm450mm$

Compute for the required area of the steel using the dimension obtain

$1845\mathrm{.}14m{m}^2$

$2122\mathrm{.}60m{m}^2$

$1859\mathrm{.}15m{m}^2$

$1794\mathrm{.}37m{m}^2$