The total profit (in dollars) from the sale of $x$ charcoal grills is $$P(x) = 20 x - 0.2 x^2 - 280$$
(A) Find the average profit per grill if 40 grills are produced.
Ave. profit =
Find the marginal average profit at a production level of 40 grills.
(B) Marginal average profit =
Use the results from parts (A) and (B) to estimate the average profit per grill if 41 grills are produced.
(C) Estimated average profit =