How long will the company continue to manufacture the phone

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Reference no: EM131007356

Annual sales of a certain cell phone has been declining at a rate of S'(t) = -420t^2/5 phones per year, where S(t) is the number of cell phones sold in t years. The company is planning on withdrawing this model when annual sales reaches 60 000 cell phones. If current annual sales of these phones are 100 000. find S(t). How long will the company continue to manufacture this phone?

Reference no: EM131007356

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