please use hungarian method and show your work. this is operation research

\begin{tabular}{r|r|r|r|r|} wrker/tsk & \multicolumn{1}{c}{1} & \multicolumn{2}{c}{2} & \multicolumn{2}{c}{3} & \multicolumn{1}{c}{} \\ \cline { 2 - 6 } & 1 & 8 & 18 & 14 \\ \hline 2 & 20 & 7 & 12 & 14 \\ \hline 3 & 15 & 1 & 8 & 1 \\ \hline 4 & 6 & 11 & 8 & 1 \\ \hline \end{tabular}