Computer warehouse.com charges $3 for shipping orders up to 10 lb, $5 for orders from 10 lb

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Computer warehouse.com charges $3 for shipping orders up to 10 lb, $5 for orders from 10 lb up to 15 lb, and $7.50 for orders of 15 lb or more. One day shipping charges for 150 orders totaled $680. The number of orders less than 10 lb was three times the number of orders weighing 15 lb or more. Find the number of packages shipped at each rate.
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College Algebra Graphs and Models

ISBN: 978-0321845405

5th edition

Authors: Marvin L. Bittinger, Judith A. Beecher, David J. Ellenbogen, Judith A. Penna

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