An existing $12"$ wide x $28"$ deep rectangular reinforced concrete beam is reinforced with $3,$ #$9$ bottom rebars at the midspan $($in a single layer$).$ Assume an effective depth, d $=24\mathrm{.}5$ inches; fc$\text{'}=6000$ psi and fy $=60\mathrm{.}000$ psi.

Using the flexural rebar specified in this existing reinforced concrete beam,

A$)$ Calculate the design moment capacity in $($ft$-$kips$)$ of the beam.

B$)$ Show, with aid of calculations, that the strength refuction factor is $\mathrm{.}90.$

DO NOT check As$,$min.