A company's revenue from selling x units of an item is given as R = 1000x - x² dollars. If sales are increasing at the rate of

Question

A company's revenue from selling x units of an item is given as R = 1000x - x² dollars. If sales are increasing at the rate of 80 per day, find how rapidly revenue is growing (in dollars per day) when 350 units have been sold.
$ per day

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