The total profit (in dollars) from the sale of x lawn mowers is.
P(x)=30x-0.03x2-750 0<=x<=1,000
(A) Find the average profit per mower if 50 mowers are produced.
(B) Find the marginal average profit at a production level of 50 mowers and interpret the results.
(C) Use the results from parts (A) and (B) to estimate the average profit per mower if 51 mowers are produced.