Basic College Mathematics (10th Edition)

Published by Pearson
ISBN 10:
ISBN 13:

Chapter 5 - Ratio and Proportion - 5.2 Rates - 5.2 Exercises - Page 344: 21

Answer

Lower unit cost is $0.099/oz, so the best buy is the 18 oz jar of peanut butter.

Work Step by Step

$\frac{1.29}{12 oz}$ = 0.108/oz $\frac{1.79}{18 oz}$ = 0.099/oz $\frac{3.39}{28 oz}$ = 0.121/oz $\frac{4.39}{40 oz}$ = 0.110/oz
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