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A produce and distributor of gift cards produces xx boxes of cards per day at an...

A produce and distributor of gift cards produces xx boxes of cards per day at an average cost ¯¯¯C(x) (in dollars) of ¯¯¯C(x)=12x+9000/3x+420 Round your answers to the nearest cent, if needed.

a. Find the average rate of change in the average cost, as production increases from 50 boxes/day to 100 boxes per day.

b.  Find the average rate of change in the average cost, as production increases from 80 boxes/day to 100 boxes per day.

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