Please be as descriptive as possible. Thank you! A W$21$ X $57($A$992)$ floor beam supports a $4\mathrm{.}5-$ inch thick reinforced concrete slab with an effective width $b$ of

$78$ inches. Sufficient shear connectors are provided to make the beam fully composite. $f^{\text{'}}c=4$ksi

A$)$ Compute the $$ Mn of the the composite beam.

B$)$ How many $\frac{5}{8}$ inch $x3$ inch shear studs are required for the beam.