The Binding Constraints for This Problem Are the First and Second

Essay

The binding constraints for this problem are the first and second.
$$\begin{array} { l r } \operatorname { Min } & x _ { 1 } + 2 x _ { 2 } \\\text { s.t. } & x _ { 1 } + x _ { 2 } \geq 300 \\&2 x _ { 1 } + x _ { 2 } \geq 400 \\&2 x _ { 1 } + 5 x _ { 2 } \leq 750 \\&x _ { 1 } , x _ { 2 } \geq 0\end{array}$$
a.Keeping c₂ fixed at 2, over what range can c₁ vary before there is a change in the optimal solution point?
b.Keeping c₁ fixed at 1, over what range can c₂ vary before there is a change in the optimal solution point?
c.If the objective function becomes Min 1.5x₁ + 2x₂, what will be the optimal values of x₁, x₂, and the objective function?
d.If the objective function becomes Min 7x₁ + 6x₂, what constraints will be binding?
e.Find the dual price for each constraint in the original problem.