Question

Mrs.o’brien purchases 112 ounces of laundry detergent for $13.44. Mr. o’brien purchases a 17.5 pound container of laundry detergent for $19.60. What is the difference in the unit price per ounce for the laundry detergent mr. and mrs. o’brien Purchase?

Answer 1

$0.05

Explanation:

Note that 1 pound = 16 ounces.

1. Mrs. O’brien purchases 112 ounces of laundry detergent for $13.44, then 1 ounce of laundry detergent costs

`\$13.44:112=\$0.12.`

2. Mr. O’brien purchases a 17.5 pound container of laundry detergent for $19.60. First, in a 17.5 pound container of laundry detergent there are

`17.5\cdot 16=280` ounces of laundry detergent. Then 1 ounce of laundry detergent costs

`\$19.60:280=\$0.07.`

3. The difference in the unit price per ounce for the laundry detergent mr. and mrs. O’brien purchase is

`\$0.12-\$0.07=\$0.05.`