Problem Blending- A company makes two types of scrap steelingots (ingot1, ingot 2) from four inputs for scrap (input1, input 2, input 3, and input 4). The chemical composition of the inputs has 2 elements (A, B) shown in table 1. The chemical composition of the output is shown in table 2. The company must produce 2000 tons of ingot 1 and 1000 tons of ingot 2. The cost and supply of the inputs of the inputs
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