How much should they charge per burrito. Max daily revenue???

Question

A restaurant chain sells 220,000 burritos each day when it charges $8.00 per burrito. For each $0.50 increase in price, the restaurant chain sells 10,000 less burritos.

Answer 1

p represents each price increase

r represents revenue

r = (220000 - 10000r)(8 + 0.50r)

 

Can you convert to vertex form and answer?