Remember that $\displaystyle{27.5}={27.50}\usepackage{cmbright}\Huge\$ . Now compare the digits of 27.50 and 27.64. The digits in the tens and ones places are the same. Comparing the tenths place, $\displaystyle{5}<{6}\usepackage{cmbright}\Huge\$ , so $\displaystyle{27.50}<{27.64}\usepackage{cmbright}\Huge\$ .