Algebra and Cell Phones

After our discussion yesterday about Verizon. I thought we should actually look at how a data plan works mathematically. This is only a surface level look at the variable cost of using a cell phone, but it will get the discussion going.

A phone plan costs 55 dollars a month for 2GB of data. For every GB you use it is an extra $27.00 a month. Roaming charges and downloading will eat up your data plan quickly. If you plan to leave the country for a vacation your data will go through the roof. How could you figure out how much your monthly bill would be if you used 7GB in one month? What about 4GB in one month? What Algebraic expression would you use to find out how much the monthly bills would be? Let's try to get some thorough responses so we can pencast it!