Max: $4x_1+3x_2$

Subject $to$:

$,3x_1+5x_{2}40$

$,12x_1+10x_{2}120$

$,x_{1}15$

$,x_1,x_{2}0$

Note: Cells B$3$ and C $3$ are the designated cells for the optimal values of $x_1$ and $x_2,$ respectively, while cell E$4$ is the designated cell for the objective function value. Cells D$8$:D$10$ designate the left$-$hand side of the constraints.

Refer to Figure $1.$ Which cell$($s$)$ are the Changing Cells as designated by "Solver"?

$B5$:$C5$

D$8$:D$10$

B$3$:C$3$

B$2$:C$2$

E$4$