Basic College Mathematics (9th Edition)

Published by Pearson
ISBN 10: 0321825535
ISBN 13: 978-0-32182-553-7

Chapter 5 - Ratio and Proportion - Review Exercises: 20

Answer

Option 2 : 17.6 pounds for 18.69 dollars is the best buy.

Work Step by Step

1. 35.2 pounds for 36.96 Dollars First we try to put the detail in ratio as $\frac{35.2 pounds}{36.96 Dollars}$ Now we have a coupon of 1 dollar for transaction above 8 pounds. So, $\frac{35.2 pounds}{35.96 Dollars}$ (36.96 - 1 = 35.96) $\approx \frac{0.98 pounds}{1 Dollars}$ 2. 17.6 pounds for 18.69 Dollars First we try to put the detail in ratio as $\frac{17.6 pounds}{18.69 Dollars}$ Now we have a coupon of 1 dollar for transaction above 8 pounds. So, $\frac{17.6 pounds}{17.69 Dollars}$ (18.69 - 1 = 17.69) $\approx \frac{0.99 pounds}{1 Dollars}$ 3. 3.5 pounds for 4.25 Dollars First we try to put the detail in ratio as $\frac{3.5 pounds}{4.25 Dollars}$ $\approx \frac{0.82 pounds}{1 Dollars}$ So compairing All three options option 2. 17.6 pounds for 18.69 dollars is the best buy.
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