Answer
$ 30\%$ per year.
Work Step by Step
While x is small, $f$ is roughly exponential, $b=0.7$.
A decline by factor $ 0.7=0.70=1-0.30=100\%-30\%$
is a decline at a rate of about $ 30\%$ per year.
Finite Math and Applied Calculus (6th Edition)
by Waner, Stefan; Costenoble, Steven
Published by
Brooks Cole
ISBN 10:
1133607705
ISBN 13:
978-1-13360-770-0
Chapter 9 - Section 9.4 - Logistic Functions and Models - Exercises - Page 668: 24b
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