Final answer:
At the proposed price point of $190 per room night, the contribution per unit for Serenity Hideaways is $145, which is obtained by subtracting the variable costs of $45 per room from the new room price.
Step-by-step explanation:
To calculate the contribution per unit (room night) for Serenity Hideaways, we need to subtract the variable costs per room night from the room price. The variable costs per room night are $45.
So the contribution per unit is calculated as follows:
New sales price per room - Variable costs per room = Contribution per unit
$190 - $45 = $145
This means that for each room night sold at the new price, Serenity Hideaways will contribute $145 towards covering fixed costs and profit.