The demand for a particular breakfast pastry is given by the demand equation px +50p =16,000, where x thousands of boxes are demanded when p cents is the price per box. If the current price of the pastry is $1.60 per box and the price is increasing at the constant rate of 0.4 cents per week, find the rate of change in demand, with respect to time.

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Exponential Growth Model

The relation that represents an exponential function is: