Answer
Phone price: ${{\$}} 110.$
Work Step by Step
We want to find the price $p$ for which
demand = supply
$-p+156=4p-394\qquad/+p+394$
$550=5p\qquad/\div 5$
$p=110$
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 1.2 - Functions and Models - Exercises - Page 74: 39a
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