Suppose total cost in dollars from the production of x printers is given by
C(x) = 0.0001x3 + 0.005x2 + 28x + 3000.
(a) Find the average rate of change of total cost when production changes from 100 to 200 printers.

(b) Find the average rate of change of total cost when production changes from 200 to 500 printers.

(c) Interpret the results from parts (a) and (b).

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