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The sales of a new​ high-tech item​ (in thousands) are given by S(t)=105-90e^ (-0.4 t) where...

The sales of a new​ high-tech item​ (in thousands) are given by S(t)=105-90e^ (-0.4 t) where t represents time in years. Find the rate of change of sales at each time.

​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?

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