Jingfei is the marketing manager for a major firm. She estimates that t days after termination of an advertising campaign for a new product, S(t) units will be sold, where

a. How many units are being sold at the time the advertising ends?

b. How many units should Jingfei expect her company to have sold 30 days after the advertising ends? After 60 days?

c. At what average rate do sales of the product change over the first 3 months (90 days) after the advertising ends?

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S(t) = 4,000e -0.015t