You may have found the correct decimal 7.4 and then divided the 4 by 100. Because the 4 is in the tenths place, the decimal part would be equal to $\displaystyle\frac{{4}}{{10}}\usepackage{cmbright}\Huge\$ , which simplifies to $\displaystyle\frac{{2}}{{5}}\usepackage{cmbright}\Huge\$ .