Answer:
P(n) = 0.5n - 5
Explanation:
Profit:
What you sold subtracted by what you invested.
Sold:
You sell each glass for 50 cents, which is $0.5.
So selling n glasses, you earn 0.5n.
Investments:
You invested $5 in ingredients.
Profit:
P(n) = 0.5n - 5