PROBLEM $2,$ Doubly reinforced rectangular beam:

Type of bending: Positive

Type of Cross Section: Rectangular, with $b=12$ in and $h=24$ in

Compressive strength of concrete: $3000.$

Tension reinforcement: Two layers of $2$ #$9$ bars each. That is$,$ a total of $4$ No$.9$ bars.

Compression reinforcement: Single layer of $2$ #$8$ bars.