Recalculate the associated reduced cost or objective values and modify the tableau. Use dual simplex to restore feasibility for $2)$a$-$d

$2.$ What will be an optimal solution to the problem in Exercise $1$

$($a$)$ if c$\_(1)$ is changed to $3?$

$($b$)$ if b$\_(2)$ is changed to $26?$

$($c$)$ if c$\_(3)$ is changed to $(1)/(2)?$

$($d$)$ if b$\_(3)$ is changed to $127?$