Answer:
$7
Step-by-step explanation:
Given: Sales volume= 1000 units.
Sales= $20000.
Variable expense= $13000.
Contribution margin= $7000.
Fixed expense= $3780
Net operating income= $3220.
Now, finding the contribution margin per unit.
Formula; Contribution margin per unit=

⇒ Contribution margin per unit=

⇒ Contribution margin per unit=

∴ Contribution margin per unit=

Hence, $7 is the contribution margin per unit.