34 12 E. The total cost, C (in thousand of dollars), of producing x (in hundred) units of some commodity is given by C-0.1.x +9 (x 20) where x is related to time, (in months), by the equation x = a. Find the rate of change of total cost with respect to number-of unit produced. 0-3XX b. Find the rate of change of total cost with respect to time after 4 months. 21 +5 (t 2 0).

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