The demand function for Sportsman 5x7 tents is given by
p=f(x)=-0.1x^2 -x+40
where p is measured in dollars and x is measured in units of a thousand.

a)Find the average rate of change in the unit price of a tent if the quantity demanded is between 5000 and 5050 tents; between 5000 and 5010 tents.

b)What is the rate of change of the unit price if the quantity demanded is 5000?

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