How much should the restaurant charge to maximize daily revenue? What is the maximum daily revenue?

Question

A restaurant sells 330 sandwiches each day. For each $0.25 decrease in price, the restaurant sells about 15 more sandwiches, all sandwiches are $6.

Answer 1

r represents revenue

p represents each decrease in price

r = (330 + 15p)(6 - 0.25p)

 

Put into standard form, determine -b/2a.