The cost (in S) of producing x-units of certain commodity is: C(x)=500+7x+0.03x². Find the average rate of change of C with respect to x when the production level is changed from x=90 to x=93 and interpret its meaning (carefully state the units). Find the instantaneous rate of change of C with respect to x when x-90 and interpret its meaning (carefully state the units). Compare your result with the one in part a).

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