Algoma Recycling collects used papers and cardboards and ships them to processing facilities for recycling purposes. They have four collection centers across the region and ship to two processing facilities. There is a cost associated with shipping each Ton of recycling material from one place to another. Additionally, there are minimum demands that must be met at the facilities and limitations on how much each center can supply. The table below shows these values: Collection center 1 2 3 4 Quantity required (Tons) Facility 1 $3 $9 $7 $2 275 Facility 2 $8 $4 $6 $4 340 Supply limit (Tons) 170 190 65 210 Formulate an LP model to determine the tons of used papers and cardboards paper to ship from each center to each facility so that total shipping costs are minimized