Final answer:
The break-even quantity for the hot dog stand is 20,000 hot dogs, and to make a $30,000 profit, the owner would need to sell an additional 10,000 hot dogs, totaling 30,000 hot dogs.
Step-by-step explanation:
To calculate the break-even quantity, we need to determine how many hot dogs need to be sold to cover the fixed costs. The calculation is done by finding the difference between the selling price and the cost price (also known as the contribution margin per unit), and then dividing the fixed costs by this margin. In this case, the contribution margin per unit is calculated as: