Answer
${{\$}} 30$ billion.
Work Step by Step
In order for the expenses to be equal to $5$ (billion), we solve
$ 5=0.16S+0.2\qquad$for S
$4.8=0.16S$
$S=\displaystyle \frac{4.8}{0.16} =30$ billion
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 1 - Section 1.4 - Linear Regression - Exercises - Page 103: 22c
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