Đáp án đúng: B
1325,16 tấn
$\displaystyle \begin{array}{l}\,\,\,\,{Manhetit}\,\,\,\,\,\xrightarrow{{}}\,\,\,\,\,\,\,\,\,\,\,\,\,{F}{{{e}}_{{3}}}{{{O}}_{{4}}}\,\,\,\,\,\,\xrightarrow{{}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{3Fe }\,\,\,\xrightarrow{{}}\,\,\,\,\,\,{Gang}\\\frac{{1049,5}{.100}}{{80}}{=1311,9}\,\leftarrow \,\frac{{760}{.232}}{{168}}\,{=1049,5}\,\leftarrow \,\,{800}{.95}{\scriptstyle{}^{{o}}\!\!\diagup\!\!{}_{{o}}\;}{=760}\,\,\leftarrow \,{800}\end{array}$
Hao hụt 1% nên thực tế cần$\frac{{1311,9}{.100}}{{99}}{=1325,16}$ tấn.