what are the constraints ,decision variables and the objective function

The Jordan Phosphate Mines Company (JPMC) operates three mines in Jordan Eshidiya, Al Hassa, and Wadi Al-Abiad mines. It supplies phosphate to four different plants. The cost of shipping phosphate from each mine to each plant, the capacity at each of the three mines, the demand at each plant and the percentage of Fluoride and sulfur content per ton of phosphate at each mine are shown in the following table Plant Mine %Fluoride % 1 Mine 3 Sulfur . Capacity (tons) Eshidiya 9 6 7 10 12 220 Al Hassa 4 9 12 170 Wadi Al- 11 14 7 280 Abiad Demand 110 160 90 180 (tons) NON 4 8 5 The cost of mining and processing phosphate is $62 per ton at Eshidiya $67 per ton at Al Hassa, and $75 per ton at Wadi Al-Abiad Each plant has different cleaning equipment. Plant 1 requires that the phosphate it receives have no more than 696 Fluoride and 59 sulfur: plant 2 phosphate can have no more than 5% Fluoride and sulfur combined: plant 3 can have no more than 596 Fluoride and 796 sulfur; and plant 4 can have no more than 696 Fluoride and sulfur combined. JPMC wants to determine the amount of phosphate to produce at each mine and ship to its customers that will minimize its total cost