At&t said it will eliminate in $30 unlimited data plan at the crush of data use from the iphone has hurt the call quality AT&T is introducing new plans costing $15 a month for 200 megabytes of data traffic or $25 for 2 gigabytes AT&T says those who exceed 2 gigbytes of usage will pay $10 a month for each additional gigabyte AT&T hopes that these plan will attract more customer

a ) Explain why AT&T's new plans might be price discrimination

b ) draw a graph to illustrate the original plan and the new plan