Lets say that you are at the store buying soda. lets also say that you are trying to decide which is the better buy- a six pack of Mountain Dew or a liter. The six pack costs about 3.50 and has 72 ounces of soda and the liter costs 1.59 and has 33 ounces. Which would be the better buy? 
     First you would have to find the price to the ounce ratio. Then you would have to find the closes amount of soda. Since the liter has a smaller amount of ounces you have to buy at least two liter bottles to be about the same amount of soda as the six pack. If you bought two liters you would have 66 ounces and that would cost 3.10 and then you still would have less soda than in  the six pack. I think that the better buy would to get the six pack rather that the liter bottles because even thought it is cheaper to buy two liters you get less soda. 



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