Answer
$10000$ dollars.
Work Step by Step
Step 1. Assume the sale is $x$ dollars. We have the earning as $300+0.05x$ dollars per week.
Step 2. Let the earning be $800$ dollars. We have $300+0.05x=800$, $0.05x=500$ and $x=10000$ dollars.
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 P - Review Exercises - Page 144: 145
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