Answer
(a) Relatives are used most often.
(b) 1950 families use relatives.
Work Step by Step
At 25%, relatives are used most often.
$0.25\times7800 = 1950$
Basic College Mathematics (9th Edition)
by Lial, Margaret L.; Salzman, Stanley A.; Hestwood, Diana L.
Published by
Pearson
ISBN 10:
0321825535
ISBN 13:
978-0-32182-553-7
Chapter 6 - Percent - 6.5 Using the Percent Equation - 6.5 Exercises - Page 432: 45
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