Problem $7\mathrm{.}7$ Uncoated bars in nominal$-$weight concrete

$A_{s\text{r}\text{e}\text{q}\text{u}\text{i}\text{r}\text{e}\text{d}}=3\mathrm{.}40$ in$2.($Ans$\mathrm{.}34\mathrm{.}2$ in$.,23\mathrm{.}5$ in$.)$