Does anyone want brainily?? HELP Fwam has a smart phone data plan that costs $20 per month that includes 6 GB of data, but will charge an extra $10 per GB over the included amount. How much would Fwam have to pay in a month where he used 3 GB over the limit? How much would Fwam have to pay in a month where he used went over by x ​GB?

Cost when over by 3 GB:
Cost when over by xx GB