A diet meal is to contain at least 7 units of vitamins, 5 units of minerals, and 11 calories. Two sets of foods are to be purchased for the said meal. Set A provides 2 units of vitamins, 1 unit of minerals, and 1 calorie. Set B provides 1 unit of vitamins, 2 units of minerals and 3 units of calories. If set A costs 180 per unit and set B costs 300 per unit, how many units of each set of foods should be purchased to minimize the costs? Solve using graphical method.

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