If the medium$-$grade ore requirement was lowered by $2$ tons: What minimum Cost could be realized? Would the optimal solution change?

Question $3$ options:

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 create a new model and rerun 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