Respuesta :

The price of each ounce of shampoo for the 20-oz bottle is:

[tex]\frac{2.90}{20}=0.145.[/tex]

And the price of each ounce of shampoo for the 12-oz bottle is:

[tex]\frac{1.35}{12}=0.1125[/tex]

Answer: The 12-oz bottle is the best buy.