What is the current optimal solution and the objective function value? The current optimal solution for mill $1$ is $4$ and $0$ for mill $2.$ The objective function value is $$24,000$

What is the objective function coefficient of decision variable $1($operation days of mill $1)?$ The objective function coefficient of decision variable $1$ is $$6,000.$

What is the sensitivity range for the objective function coefficient of decision variable $1($operation The sensitivity range for the objective function coefficient of decision variable $1$ is $(0,$$$7,000).$

If the operation cost of mill $1$ increases from $$6000$ to $$7500,$ will the optimal solution change? And If the operation cost of mill $1$ increases from $$6,000$ to $$7,500,$ the optimal solution will change be range of the mili $1$ objective coefficient.

What is the objective function coefficient of decision variable $2($operation days of mill $2)?$ The objective function coefficient of decision variable $2$ is $$7,000.$

What is the sensitivity range for the objective function coefficient of decision variable $2($operation The sensitivity range for the objective function coefficient of decision variable $2$ would be

If the operation cost of mill $2$ decreases from $$7000$ to $$6500,$ will the optimal solution change? An