Required:

Classify each item as a differential cost, a sunk cost, or an opportunity cost in the decision to replace the old X $-$ray machine with a new machine. If none of the categories apply for a particular item, select "None".

$\backslash$table$[[\backslash$table$[[$Item$]],$Cos$],[$Example: Cost of X$-$ray film used in the old machine,Differential Cost$],[1.$ Cost of the old $x-$ray machine,Sunk Cost$],[2.$ The salary of the head of the Radiology Department,None$],[3.$ The salary of the head of the Laboratory Department,None$],[4.$ Cost of the new digital $x-$ray machine,$],[5.$ Rent on the space occupied by Radiology,$],[6.$ The cost of maintaining the old machine,$],[7.$ Benefits from a new DNA analyzer,$],[\backslash$table$[[8.$ Cost of electricity to run the $x-$ray machines$]],]]$