Jim decides to buy mayo in bulk. He can buy 1 gallon of mayo at Costco for 8 dollars. At the normal store, a 16-ounce bottle costs $3. How much money does he save by buying the gallon container? Let's be accurate as possible.
A gallon is 1 * 128 = 128 ounces. So he needs to buy 128 / 16 = 8 of the small bottles. That would cost 8 * 3 = 24 dollars. So he saves 24 - 8 = $16.
The answer: 16.