You may have solved the proportion $\displaystyle\frac{{14}}{{100}}=\frac{{140}}{{n}}\usepackage{cmbright}\Huge\$ , but the percent is the amount out of 100 and the amount is 14. So the correct proportion is $\displaystyle\frac{{140}}{{100}}=\frac{{14}}{{n}}\usepackage{cmbright}\Huge\$ .