1. Before going any further, rank the brands according to which you think is the highest ? Record the price and the volume of each brand. For example, if a 14-ounce can costs $.89, you would list $.89/14 oz
2. Translate the price per volume into price per ounce. Our 14-ounce can costs $.064 per ounce ? Now rank the price per ounce (we'll call it x) from the highest (1) to the lowest (5 or 6, again depending on how many brands you have).