The total cost (in dollars) of printing x dictionaries is
C(x)=20,000+10x
(A) Find the average cost per unit if 1,000 dictionaries are produced.
(B) Find the marginal average cost at a production level of 1,000 units and interpret the results.
(C) Use the results from parts (A) and (B) to estimate the average cost per dictionary if 1,001 dictionaries are produced.