$\displaystyle{3},{200}\ \text{ pounds}+{7},{200}\ \text{ pounds}+{600}\ \text{ pounds}={11},{000}\ \text{ pounds}\usepackage{cmbright}\Huge\$

Convert pounds to tons:

$\displaystyle{11},{000}\ \text{ pounds}\cdot\frac{{{1}\ \text{ ton}}}{{{2},{000}\ \text{ pounds}}}={5}\frac{{1}}{{2}}\ \text{ tons}\usepackage{cmbright}\Huge\$