Answer
The 64oz bottle is the better buy.
Work Step by Step
$\frac{\$0.65}{12\ oz}=\frac{\$0.65\div12}{12\ oz\div12}=\frac{\$0.054}{1\ oz}$
$\frac{\$2.98}{64\ oz}=\frac{\$2.98\div64}{64\ oz\div64}=\frac{\$0.047}{1\ oz}$
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