Answer:
$80 per unit
Step-by-step explanation:
We know that,
Contribution per unit = Selling price per unit - variable cost per unit
= $100 per night - $20 per rented room
= $80 per unit
Simply we deduct the variable cost per unit from the Selling price per unit so that the contribution margin can be computed
All other information which is given is not relevant. Hence, ignored it