One golden rule, go to company with some reference. Someone who works in that company and ask them details. The guy you talk to should not be relative or any way related to company. He should not tell you some crap because be gets a bonus. There are many factors, you have to negotiate accordingly, but on the baseline above are some common percentage and salary. It varies with experience and technology.
Overall, the point is you have to talk to employer in the beginning and clarify the Salary and benefits. Because, if you do not and get into a longterm project, you lose money. Employers are very intelligent, they say we will give you a hike after First project and if you are lucky and get a good project that runs long, you are stuck.
There are many H1B sponsors in Hyderabad who could boast for best services but at Max consultant Hyderabad our main priority is the satisfaction of customers by our best possible services. Many customers have applauded us after getting our services this has made us best H1B consultants in Hyderabad.