MS from US

Hi, I have done Bachelor of Commerce from Delhi University with 40% marks, 12th from National Open School with 66% marks and 10th from CBSE with 75% marks. I have a working experience of more than 10 years (7 years in sales & 3 years in Operations/Administration). I have no experience or degree in computers. I want to do Masters in Computer Science or Mathematics from US. Am I eligible for any of the two? From which US University do you suggest I should do it? Kindly suggest the University with an average fee.