How hard is it to obtain a Green Card/American Residency through marriage?

and what are the costs involved!?How hard is it to obtain a Green Card/American Residency through marriage?
It is not that hard if you came over legally, your marriage is genuine and the US Citizen is financially able to support the foreign spouse. You need to gather all the documents to serve as a proof that you have a bonafide marriage. The filing fee for Adjustment of Status $1,010.00 and you can apply along with it your EAD (work permit) and Advance Parole for free. You will also be spending for medical fee which is one of the requirements when you apply for Adjustment of Status.How hard is it to obtain a Green Card/American Residency through marriage?
It varies GREATLY according to what country you are from...If you're mexican,its cheap %26amp; easy...if you are Asian,it costs a bundle and takes a year or more.