A company that manufactures pet toys calculates that its costs and revenue can be modeled by the equations C- 15,000 1.25 and R 500x - 25 where x is in the number of toys produced in I week. Production during one particular week is 5000 toys and is increasing at a rate of 350 toys per week. Find the rate at whic changing. (a) cost dC dollars/week dt (b) revenue dR dollars/week dt (c) profit dP dollars/week dt

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