Basic College Mathematics (10th Edition)

Published by Pearson
ISBN 10: 0134467795
ISBN 13: 978-0-13446-779-5

Chapter 5 - Ratio and Proportion - 5.2 Rates - 5.2 Exercises - Page 345: 36


You should buy Brand K.

Work Step by Step

We compare the price (per tissue) of Brands K and S. We use a calculator for the division. Brand K: $\$5$ for $3$ boxes: $\$5\div3=\$1.67/box$ $\$0.45$ coupon for 1 box: $\$1.67-\$0.45=\$1.22/box$ $175$ tissues/box: $\$1.22/175\approx \$0.007/tissue$ Brand S: $\$1.29$ for $1$ box: $\$1.29/box$ $\$0.20$ coupon for 1 box: $\$1.29-\$0.20=\$1.09/box$ $125$ tissues/box: $\$1.09/125\approx \$0.009/tissue$ Therefore, Brand K is $\approx \$0.002/tissue$ cheaper than Brand S. You should buy Brand K.
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