What is the current optimal solution and the objective function value?

What is the objective function coefficient of decision variable $1($operation days of mill $1)?$

What is the sensitivity range for the objective function coefficient of decision variable $1($operation da

If the operation cost of mill $1$ increases from $$6000$ to $$7500,$ will the optimal solution change? And $w$

What is the objective function coefficient of decision variable $2($operation days of mill $2)?$

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

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

Which constrains are binding?