Location Problem with Iwo Sites. Oliveira Ottice Supply has a large retall system consisting of twelve stores spread around the country, often in direct competition Kilroy. However, managers at Oliveira have decided to use two national distribution centers. When Oliveira's stores are mapped on the same grid as Kilroy's, the st locations occur at the coordinates listed in the following table. As in the previous exercise, there are also data to indicate how many trips are made annually to each store: \begin{tabular}{|l|r|r|l|} \hline \multicolumn{2}{|l|}{ Coordinates } & Trips \\ \hline Site (k) & xk & yk & nk \\ \hline 1 & 2 & 96 & 21 \\ \hline 2 & 5 & 41 & 12 \\ \hline 3 & 20 & 10 & 20 \\ \hline 4 & 44 & 48 & 15 \\ \hline 5 & 60 & 58 & 27 \\ \hline 6 & 100 & 4 & 8 \\ \hline 7 & 122 & 94 & 21 \\ \hline 8 & 138 & 80 & 16 \\ \hline 9 & 150 & 40 & 10 \\ \hline 10 & 170 & 18 & 18 \\ \hline 11 & 182 & 2 & 25 \\ \hline 12 & 190 & 56 & 14 \\ \hline \end{tabular} a. Find the optimal location for Oliveira's two distribution centers in this expanded version of the