transportation problem

Solve the following transportation problems using the least cost method. Determine the transportation cost for both.

1- \begin{tabular}{|l|l|l|l|l|l|} \hline & D1 & D2 & D3 & D4 & supply \\ \hlines1 & 10 & 5 & 10 & 3 & 10 \\ \hlines2 & 40 & 10 & 10 & 1 & 10 \\ \hlines3 & 15 & 5 & 5 & 1 & 20 \\ \hline Demand & 10 & 10 & 10 & 10 & 0 \\ \hline \end{tabular} \begin{tabular}{|l|l|l|l|l|l|} \hline & D1 & D2 & D3 & D4 & Supply \\ \hlineS1 & 3 & 21 & 10 & 3 & 20 \\ \hlineS2 & 40 & 100 & 10 & 50 & 10 \\ \hlineS3 & 15 & 5 & 40 & 90 & 30 \\ \hline Demand & 25 & 15 & 10 & 10 & 69 \\ \hline \end{tabular}