Answer:
See below
Step-by-step explanation:
Computation of the contribution margin per unit is shown below;
Contribution margin per unit = Selling price per unit - Variable cost per unit
Where,
Selling price per unit = $57
Variable cost per unit = $34 - $5 = $29
Then,
Contribution margin per unit = $57 - $29
Contribution margin per unit = $28 per unit.
Therefore, the contribution margin per unit if the machine is purchased is $28 per unit