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Monthly sales of a particular personal computer are expected to decline at the following rate of S'(t) computers per month, where t is time in months and S(t) is the number of computers sold each month. S'(t) = - 20t The company plans to stop manufacturing this computer when monthly sales reach 600 computers. If monthly sales now (t = 0) are 1,560 computers, find S(t). How long will the company continue to manufacture this computer? S(t) = How long will the company continue to manufacture this computer? Approximately months. (Round to the nearest whole number.)