14. A refinery makes three grades of petrol A, B, C from three crude oils

d, e andf Crude oil/ can be used in any grade but the others must satisfy the following specifications:

It is desired to obtain maximum profit. Formulate this as a Linear Programming Problem.

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Grade A B C Selling price per litre 18.0 16.5 15.5 Specification Not less than 50% crude d Not more than 25% crude e Not less than 25% crude d Not more than 50% crude e No specifications There are capacity limitations on the amounts of the three crude elements that can be used: Crude d e f Capacity (kl) 500 500 360 Price per litre 19.5 14.5 15.1