maximum revenue question

Question

a pizza company's research shows that a 0.25 increase in the price of a pizza results in 50 fewer pizzas being sold. The usual price of $15 for a three-item pizza results in sales of 1000 pizzas. write the algebraic expression that models the maximum revenue for this situation

Answer 1

r represents the revenue

p represents each price increase

r = (1000 - 50p)(15 + 0.25p)