Answer
$ 20\%$
Work Step by Step
$1985$ is 2 years after 1983, so $t=2.$
At $t=1$, we estimate $f(1)\approx 1.5$
At $t=2$, we estimate $f(2)\approx 1.8$
an increase of $0.3$, which is a $ 20\%$ increase of the value $1.5$ at $t=1.$
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: 23b
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