Coppereld Mining Company owns two mines, each of which produces three
grades of ore - high, medium, and low. The company has a contract to supply
a smelting company with at least 12 tons of high-grade ore, 8 tons of medium-
grade ore, and 24 tons of low-grade ore. Mine 1 produces 6 tons of high-grade
ore, 2 tons of medium-grade ore, and 4 tons of low-grade ore for each hour it
operates. Mine 2 produces 2 tons of high-grade ore, 2 tons of medium-grade
ore, and 4 tons of low-grade ore for each hour it operates. The cost of operating
mines is $200 for mine 1 and $160 for mine 2.
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