Assume all else remains the same. What percentage of metal from Chopin Yards that requires further processing would make Rex Metal Fabricators indifferent between buying from Chopin Yards and Joe Company? \begin{tabular}{|l|r|r|r|} \hline & \multicolumn{1}{l|l}{ Chopin Joe } & \multicolumn{1}{l|}{ Total } \\ \hline & Yard & \multicolumn{1}{l|}{ Company } \\ \hline Total purchases (tons) & 1500 & 1000 & 2500 \\ \hline Average purchase price (per ton) & $124.00 & $120.00 & $122.00 \\ \hline Total purchase Price & $186,000.00 & $120,000.00 & $305,000.00 \\ \hline Percentage requiring further processing & 2.00% & 7.50% & 4.20% \\ \hline Cost to treat the metal (per ton) & 80 & 80 \\ \hline Total cost to treat the metal & $2,400.00 & $6,000.00 \\ \hline Total effective cost & $188,400.00 & $126,000.00 \\ \hline Effective Cost per ton & $125.60 & $126.00 \\ \hline & & & \\ \hline & & & \\ \hline Total purchase (tons) & 1500 & 1500 & \\ \hline Average price per ton & $124.00 & $120.00 \\ \hline Percent needing further processing & 2.00% & 7.50% \\ \hline Amount for further processing in tons & 30 & 112.5 \\ \hline & & \\ \hline & & & \\ \hline \end{tabular}