Question

A 20-oz bottle of shampoo cost $2.90. A 12-oz bottle costs $1.35. Which is the better buy?

Answer 1

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

$\frac{2.90}{20}=0.145.$

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

$\frac{1.35}{12}=0.1125$

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