The sales of a new high-tech item (in thousands) are given by the following function, where t represents time in years. Find the rate of change of sales at each time. S(t) = 110 - 100 e - 0.4t (a) After 1 year. (b) After 5 years. (c) What is happening to the rate of change of sales as time goes on? (d) Does the rate of change of sales ever equal zero? . . " ed: (a) The rate of change after 1 year is thousand items per year. tore (Round to three decimal places as needed.) nissi