Solution:
We have the following data:
- Nathan has a smartphone data plan that costs $25 per month that includes 5 GB of data.
- Will be charged an extra $20 per GB over the included amount.
Then if he used 5 GB over the limit then will be charged an extra of
5 GB x $20 = $100
thus Nathan has to pay in a month where he used 5 GB over the limit an amount of:
$25 + $100 = $125
On the other hand, if he used 2 GB over the limit then will be charged an extra of
2 GB x $20 = $40
thus Nathan has to pay in a month where he used 2 GB over the limit an amount of:
$25 + $40 = $65