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Blacktop Refining extracts minerals from ore mined at two different sites in Montana.
Each ton of ore type 1 contains 20% copper, 20% zinc and 15% magnesium.
Each ton of ore type 2 contains 30% copper, 25% zinc and 10% magnesium.
Ore type 1 cost $90 per ton.
Ore type 2 cost $120 per ton.
Blacktop would like to buy enough ore to extract at least 8 tons of copper, 6 tons of zinc, and 5 tons of magnesium in the least costly manner
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