42. Profit analysis. The total profit (in dollars) from the sale of x gas grills is P(x) = 20x - 0.02x- - 320 0 s x = 1,000 (A) Find the average profit per grill if 40 grills are produced. (B) .Find the marginal average profit at a production level of 40 grills and interpret the results. (C) Use the results from parts (A) and (B) to estimate the average profit per grill if 41 grills are produced