Answer:
b. $20.
Step-by-step explanation:
Regardless of what the break-even volume is, at this volume profits are zero.
This means that any unit sold beyond this point will provide a profit equivalent to its marginal benefit, which is its selling price subtracted by its variable cost.
If a product sells for $50 and has a variable cost of $30, by selling one unit in excess of its break-even volume, the profit will be:
The profit will be $20.