A 60-ounce bottle of soda cost $1.20 at the grocery store. A 20-ounce bottle of soda cost $1.00.

Well assuming you mean which will be the better option it would be the 60 ounce and 1.20 option. Since if you find the unit rate for that you’d only get 0.02 dollars for each ounce of soda. And for the 20 ounce one you’d get 0.05 dollars per ounce. The better option is the 60 ounces bottle for 1.20.