Min. $,A+2B$

s$.$t$.$

$A+B300$

$2A+5B750$

$2A+B400$

$A,B0$

Denote, coefficient for $B$ is $C2,$ and

coefficient for $A$ is $C1.$

Keeping $c2$ fixed at $2,$ over what range

can c$1$ vary before there is a change in the

optimal solution point?

Keeping $c1$ fixed at $1,$ over what range

can c$2$ vary before there is a change in the

optimal solution point?

If the objective function becomes Min

$1\mathrm{.}5A+2B,$ what will be the optimal values

of $A,B$ and the objective function?