A company maufacturing both Agassi and Sampras models of tennis raquets has found that the respective demand equations are

pA= 50+5x-8y

Ps= 80-12x+5y

when x is the weekly demand for an Agassi raquet priced at $pA and y is the weekly demand for a Sampras raquet priced at $pS. What is the weekly revenue R from the sales of these raquets?

1. 5x^2+ 5y^2 20xy + 50x + 80y

2. 5x^2 + 5y^2 20xy 50x + 80y

3. 5x^2 + 5y^2 20xy + 50x 80y

4. 5x^2 + 5y^2 + 20xy + 50x + 80y

5. 5x^2 + 5y^2 + 20xy 50x 80y

At what price should the company set the Agassi raquet to maximize revenue?

35, 36, 37, 38 or 39