2. William's cell phone bill was $135.65. He had to pay $45 for
the plan and then pay per gigabyte. He used 5 gigabytes. How much
did he pay per gigabyte?
Take away the monthly $45 cost of the cell phone plan, and you see that he paid $90.65 for the 5 gigabytes of data that he used...to find what he paid per gigabyte, $90.65 / 5 = $18.13 per gigabyte.
