You have 5 cell phones on your family plan and lets say it costs $100 a month. A close friend says "can you get a 6th fone on your plan for me and I'll pay the 10 monthly fee. I dont use many minutes"
You say "now there are 6 phones @ $110 a month so the fee for the 6th fone is really $18. " Friend says thats nuts, you say its fair.
Who is wrong?