Problem $19\mathrm{.}12$ Calculate the deflection at the centerline of the beam of Problem $19\mathrm{.}1$ immediately after the cables are cut. Assume $P$ initial $=240k$ and $P$ after losses $=190k.$ Repeat the calculation after losses if $20-$k concentrated live loads are located at the one$-$third points of the beam and $f_c^{\text{'}}=5000.$ Assume that cables are straight and no loads are present other than the beam weight and the two $20-k$ loads. Use $I_g$ for all calculations.