31. Two kinds of food for children, F 1 and F2, are being considered to be purchased. Food F 1 costs Rs 20 a unit while food F2 is available at Rs 40 per unit. The nutrient contents of these foods are as follows:

The minimum requirement of three nutrients is respectively, 200, 36 and 54 units.
Draft this as an LPP and find out graphically the quantities of food units which should be bought in order that the costs are minimised satisfying the given constraints.

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Nutrients N N Food F 40 38 N3 18 Nutrient content Food F 223