Shum Manufacturing, which uses the high$-$low method, makes a product called Jpop. The company incurs three different cost types $($A$,$ B$,$ and C$)$ and has a relevant range of operation between $2,500$ units and $10,000$ units per month. Per$-$unit costs at two different activity levels for each cost type are presented below.

$\backslash$table$[[,$Type A$,$Type B$,$Type C$,$Total$],[5,000$ units,$$4,$$$9,$$$4,$$$17$