P$2\mathrm{.}123$ A barge has the trapezoidal sh $D_{\text{b}\text{r}\text{a}\text{s}\text{s}}=0\mathrm{.}0427m$ total weight of barge and cargo in shown in Fig. P$2\mathrm{.}123$ and is $22m$ long into the paper. If the rage $1<mn>4</mn>$ and is $3\mathrm{.}5$ tons, what is the drating in seawater?