word problem

[sop]

The total profit in $ for sales of x rowing machines is given by P(x)=-0.2x^2+300x-200. What is the profit if 500 are sold? for what value of x will the profit be at a maximum and what will be its value (P)?

 

[stapel]

What is the profit if 500 are sold?

Evaluate at x = 500.

[F]or what value of x will the profit be at a maximum and what will be its value (P)?

Find the vertex.

Eliz.