Marty is looking for a bargain this week on serial the table list the current prices on three different types of cereal what is the difference between the lowest price per ounce and the highest price per ounce

Mighty bites : 5/20 = 0.25 per oz
no-cal flakes : 4.5/15 = 0.30 per oz
sugar oats : 2/10 = 0.20 per oz

difference between the lowest and the highest...
0.30 - 0.20 = 0.10there is a 10 cent difference

Divide each price by its number of ounces to find the unit price.
The higher the unit price the more expensive it is.
The best bargain is the lowest price per ounce.

MB: $5/(20 oz) = $0.25/oz

NCF: $4.50/(15 oz) = $0.30/oz

SO: $2.00/(10 oz) = $0.20/oz

The unit prices ($ per oz) are 0.25, 0.30, and 0.20.

The lowest price per oz is $0.20/oz.
The highest price per oz is $0.30/oz.

The difference is $0.30/oz - $0.20/oz = $0.10/oz

The difference is $0.20/oz