$($B$)$ A computer manufacturer is deciding whether to produce a large monitor with a thin fler

screen. One of the manager suggested that the incremental costs for this line of manufataring

will be primarily variable because the company currently has a lot of idle capacity.

$($i$)$ What is the cost object in this decision?

$($ii$)$ What is the opportunity cost for using this decision?

$($C$)$ Define Semi$-$variable cost and Semi$-$fixed cost with diagram.