The vapour density of $N_2O_4$ at a certain temperature is $30$ . Calculate the percentage dissociation of $N_2O_4$ at this temperature $N_2O_4 (g) \leftrightarrow 2NO_2(g)$

Question

$\begin{array}{1 1} 50 \% \\ 52 \% \\ 53.3 \% \\ 54\% \end{array} $