Equity minimum for the production contract is 1509 a week. I know personally that many of the numbers on this thread are exaggerated. An actor joining a long running show in a principle (not necessarily a "final bow" role, but a white contract) usually starts out around 1800-2500. Now, increases (at time of contract renewal) are usually written in as options in the original contract, and are set up to a time period (12-18 months from original signing).
For example if you were to join Lion King as Nala (a principle part that doesn't understudy another)you would be offered a decent amount above minimum (see above) for 6-9 months, with a options to extend at a pre-determined increase at different intervals.
Obviously these numbers are not concrete, and every single situation is different. Certainly someone who has solid broadway credits has more negotiating power than someone who is making their debut.
Equity dues are in the neighborhood of 2%
No franchised Agent is allowed to take more than 10% of the nogotiated salary as per Equity rules.
Managers are a completely different story since they are not regulated.
Based on my knowledge-7-10k is a little high for all but a few of the regular broadway people (i.e. stars to us, but not the general public) currently playing leading roles.
Other than that, did you enjoy the play Mrs Lincoln?