K 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) = - 40t The company plans to stop manufacturing this computer when monthly sales reach 500 computers. If monthly sales now (t= 0) are 2,660 computers, find S(t). How long will the company continue to manufacture this computer? S(1) =