On Charlie's cell phone plan, he signed up for 8GB of data per 4 week period. If he went over the 8GB per month, it would cost him an extra $10.00 per GB.
In the first week, he used 2 GB; in the 2nd week, he used 3 GB; in the 3rd week, he used 5 GB; and in the 4th week, he used a whopping 10GB.
How much extra did Charlie need to pay on his cell phone bill?	Choose the correct answer:
A) $120
B) $40
C) $80
D) $100
E) $140
To determine how much extra he would need to pay, you have to add all 4 weeks of GB usage (2+3+5+10 = 20).   To determine the extra amount of GB usage, you have to subtract the the original amount of GB (8) allowed on his plan. 20-8 = 12   To determine the extra cost on his cell phone plan, you have to multiply $10.00 per extra usage (12) for a total of $120.00.   The correct answer is $120
<result>A</result>
On Charlie's cell phone plan, he signed up for 8GB of data per 4 week period. If he went over the 8GB per month, it would cost him an extra $10.00 per GB.
In the first week, he used 2 GB; in the 2nd week, he used 3 GB; in the 3rd week, he used 5 GB; and in the 4th week, he used a whopping 10GB.
How much extra did Charlie need to pay on his cell phone bill?