note: please it is second time to post this question first you given me uncomplete answer so please answer this question correctly and use talbes.

find intial solution

a) north west corner rule

b) min. cost rule

this is operation research

\begin{tabular}{l|c|c|c|c|} & \multicolumn{1}{c|}{ M2 } & \multicolumn{1}{c|}{M3} & \multicolumn{1}{c|}{M4} \\ \cline { 2 - 5 } S1 & 13 & 11 & 5 & 4 \\ \hline S2 & 17 & 19 & 2 & 11 \\ \hline S3 & 19 & 8 & 2 & 16 \\ \hline Dmnd & 40 & 40 & 20 & 120 \end{tabular} Supply 80 80 60