Hello I have a question on Data Analyses

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company produces 3 types of industrial solvents (S1, S2, S3) by blending 3 grades of distillates (D1, D2, D3) in different proportions. The selling price per gallon for solvents S1, S2, and S3 are $4.50, $4.00, and $3.00, respectively. The cost price per gallon for distillates D1, D2, and D3 are $3.00, $2.50, and $2.00, respectively. The company is contractually obligated to produce at least 1,000,000 gallons of each solvent . It has 2,000,000 gallons of each distillate available in its inventory. For each solvent , regulations dictate the minimum proportion by volume of distillate D1 required , and the maximum proportion by volume of distillate D3 allowed . For example, solvent S1 must contain at least 60 % of distillate D1, and no more than 20 % of distillate D3. There are no restrictions on the proportion of distillate D2 . The table below specifies these restrictions and summarizes other relevant information?