Math

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A company is increasing production at the rate of 25 units per day. The daily demand function is determined by the fact that the price (in dollars) is a linear function of q. At a price of $70, the demand is 0, and 100 items will be demanded at a price of $60. Find the rate of change of revenue with respect to time (in days) when the daily production (and sales) is 20 items.

I think I know how to do the actual math, but I'm unsure how to set up the problem.
Thanks for your help!

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