Worked examples
Two examples
Example 1
Which is the better buy: a box of cereal with 12 ounces for $3.00, or one with 16 ounces for $3.84?
- Price of one ounce: 3.00 ÷ 12 = $0.25, and 3.84 ÷ 16 = $0.24.
- The lower price per ounce is the better buy.
Answer: The 16-ounce box
Example 2
Which is the better buy: 8 batteries for $6.00, or 20 batteries for $16.00?
- 6.00 ÷ 8 = $0.75 a battery. 16.00 ÷ 20 = $0.80 a battery.
- The pack of 8 costs less per battery.
Answer: The 8-battery pack
Where this is taught: Ratio, Proportion, and Percent, “Which is the better buy?”
The drill
Ten problems
How many:
Tap your answer to each one, then press Check my answers at the bottom.Circle your answer to each one. The answer key, with the reasoning, is on the last page.