How to solve

For the following problem UNLESS NOTED OTHERWISE use normal weight concrete with a unit weight of $150$pcf$,1\mathrm{.}5$ in for beam clear concrete cover, and $0\mathrm{.}75$ in$.$ for slab clear concrete cover.

$2\mathrm{.}3$ Consider a reinforced concrete beam with a width $(b)$ of $14in.$ and an effective depth $($d$)$ equal to $36$ in$.f_c^{\text{'}}=4,000,$ and $f_y=60,000$ psi. Determine the moment capacity of this beam, $M_R,$ for the following reinforcements:

$($a$)4$ #$6$ bars

$($b$)4$ # $7$ bars

$($c$)4$ #$8$ bars

$($d$)4$ #$9$ bars