Incorrect. The sum of the measures of the interior angles of any quadrilateral is $\displaystyle{{360}}^{\circ}\usepackage{cmbright}\Huge\$ . For this figure, we have:

$\displaystyle{{230}}^{\circ}+{{50}}^{\circ}+{{50}}^{\circ}+{m}\angle{C}={{360}}^{\circ}\usepackage{cmbright}\Huge\$

Solve the equation for $\displaystyle{m}\angle{C}\usepackage{cmbright}\Huge\$ . The correct answer is 30.