A chemical plant requires 106 L/day of a solution. Three sources are available at different prices and supply rates. Each source also has a different concentration of an impurity that must be kept below a minimum level to prevent interference with the chemical. The data for the three sources summarized in the following table. Determine the amount from each source to meet the requirements at the leastcost.

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Source 1 Source 2 Source 3 Required Cost ($/4 Supply (105 L/doyl Concentration (mg/l) 0.50 20 135 1.00 1.20 minimize 10 210 <100 100 75