Answer
$15$ billion.
Work Step by Step
The additional spending forms a geometric series
$10(0.6), 10(0.6)^2$
and the total economic impact is the sum as
$S=\frac{10(0.6)}{1-0.6}=15$ billion.
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter 10 - Section 10.3 - Geoetric Sequences and Series - Exercise Set - Page 1076: 86
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