We were required to look up the prices of mountain dews. We needed to find the price of a 2 liter bottle and compare it to a 12-pack. After I searched it, I found out that the 2 liter bottle of Mountain Dew was cheaper, therefore a better deal, than the 12-pack. 
   The math that I used to solve this was simple. I just looked up the two prices, found out that the 2 liter is cheaper than the 12-pack, and subtracted the prices to find the difference. This subject can be used for problems that are similar to this one.