The total debt for the 7 tickets is $\displaystyle{7}{\left(-{28}\right)}+{\left(-{25}\right)}\usepackage{cmbright}\Huge\$ . You probably correctly found $\displaystyle{7}{\left(-{28}\right)}\usepackage{cmbright}\Huge\$ , but then added the $\displaystyle\text{\$}{25}\usepackage{cmbright}\Huge\$ to this amount. It is true that the ticket agency added the fee, but this amount is also a debt, so you should be adding $\displaystyle-{25}\usepackage{cmbright}\Huge\$ to the cost of the 7 tickets. The correct answer is $\displaystyle-\text{\$}{221}\usepackage{cmbright}\Huge\$ .