The sales of new hightech item in thousands are given by St

The sales of new high-tech item (in thousands) are given by S(t) = 102 - 100e -0.3t where t represents time in years. Find the rate of change of sales at each time. After 1 year. After 5 years. What is the happening to the rate of change of sales as time goes on? Does the rate of change of sales over equal zero? ds/dt=30e^(-0.3t) a.)22.22 b.)6.69 c.)IT deceases to near to 0 d.)no