You may have divided $\displaystyle{33}\div{11}\usepackage{cmbright}\Huge\$ and set it over the denominator 2. You need to find $\displaystyle{5}\frac{{1}}{{2}}\div{33}=\frac{{11}}{{2}}\cdot\frac{{1}}{{33}}\usepackage{cmbright}\Huge\$ to get the answer.