Basic College Mathematics (10th Edition)

by Lial, Margaret L.; Salzman, Stanley A.; Hestwood, Diana L.

Published by Pearson

ISBN 10: 0134467795

ISBN 13: 978-0-13446-779-5

Chapter 1 - Whole Numbers - 1.10 Solving Application Problems - 1.10 Exercises - Page 95: 21

Answer

Estimate: $200; Exact: $350

Work Step by Step

To estimate, we round 695 to 700, 340 to 300, 435 to 400, 240 to 200, 180 to 200, and 2240 to 2000. To find an estimate of her spending, we add 700 + 300 + 400 + 200 + 200 = 1800, so her estimated monthly savings is 2000 - 1800 = 200. To find her exact spending, we add 695 + 340 + 435 + 240 + 180 = 1890, so her exact monthly savings is 2240 - 1890 = 350.

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