Answer
The 8oz bottle is the better buy.
Work Step by Step
A unit rate has 1 in the denominator.
$\frac{\$0.99}{8oz}=\frac{\$0.99\div8}{8oz\div8}=\frac{\$0.124}{1oz}$
$\frac{\$1.69}{12oz}=\frac{\$1.69\div12}{12oz\div12}=\frac{\$0.141}{1oz}$
$0.124\lt0.141$
