The difference between the left-hand side and right-hand side of a less-than-or-equal-to constraint is referred to as surplus constraint slack shadow price A mining company owns two mines, each of which produces three grades (high, medium, and low) of ore. The compeny has a coniract to supply a smelting company with at least 12 tons of high-grade ore, at least 8 tons of medium-grade ore, and at least 24 tons of low-grado ore. Fach hour of operation, mine I produces 6 tons of high-grade ore, 2 tons of medium-grade ore, and 4 tons of low-grade ore. Each hour of operation, mine 2 produces 2 tons of high-grade ore, 2 tons of medium-grade ore, and 12 tons of low-grade ore. It costs $200 per hour to operate mine 1 and $160 per hour to operate mine 2 . How many hours should each mine be operated so as to meet the contractual obligations at the lowest total operating cos? Use this sensitivity report to answer the questions below. If the medium-grade ore requirement was lowered by 2 tons: What minimum Cost could be realized? Would the optimal solution change? The shadow price of $70 is operative Thus, the minimum Cost would be $820. The optimal solution will change. The shadow price of $70 is not operative. Thus, we should ereate a new model and rerua solver to answer this question. Not enough information provided. We should create a new model and rerun solver. The shadow price of $70 is operative Thus, the minimum Cost would be $540. The optimal solution will change. None of the above