Problem $04\mathrm{.}047-$ Moment capacity of a reinforced concrete slab using allowable stress

A concrete slab is reinforced by $\frac{5}{8}-$in$.-$diameter steel rods placed on $5\mathrm{.}5-$in$.$ centers as shown. The modulus of elasticity is $3{10}^6$ for the concrete and $29{10}^6$ psi for the steel. Using an allowable stress of $1400$ for the concrete and $19\mathrm{.}4$ksi for the steel, determine the largest bending moment in a portion of slab $1ft$ wide.

The largest bending moment is

kip.ft$.$