The following information applies to the questions displayed below. Rex Metal Fabricators $($RMF $)$ buys scrap metal and produces components for buildings and other structures $.$ The purchase contracts specify an average quality level of $73$ percent $.$ That is$,73$ percent of the metal must be ready for use without further processing. Metal that is not ready can be treated at extra cost by RMF$,$ and this is more cost$-$effective than scrapping the metal and purchasing additional amounts. The cost of treating the metal requiring further processing is $$80$ per ton RMF uses two suppliers : Chopin Yards and Joe Company $.$ During the past year, the purchasing quality data were as follows : Total purchases $($tons $)$ Average purchase price $($ per ton$)$ Percentage requiring further processing Chopin $4,900124\mathrm{.}0019\mathrm{.}0$ Joe Company $2,700154\mathrm{.}0016\mathrm{.}0$ Total $7,600134\mathrm{.}6617\mathrm{.}9$ Required: 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 $?$ Note: Enter your answer as a percentage rounded to $1$ decimal place $($i$.$e$.,\mathrm{.}321$ as $32\mathrm{.}1).$