Answer :
We will see that her expected profit is -$5.
What is the profit?
We define profit as the difference between the revenue and the costs.
In this case, we know that she expects to sell 20 cups of lemonade for $1 each, so the expected revenue would be:
20*$1 = $20.
And we also know that her costs are $10 for a sign and $15 for materiales, so the total cost is:
$10 + $15 = $25
Finally, the profit would be:
P = revenue - cost = $20 - $25 = -$5
So she has a negative profit.
If you want to learn more about profit, you can read:
https://brainly.com/question/19104371