Actors are covered by 2 unions -- Actors Equity Association (AEA) and SAG-AFTRA. I sent you the link for AEA contracts for your question on Dance Salaries. As for SAG-AFTRA, rates vary, but the base pay for a union background actor is $159/8 hours. In both cases, you need to be in the union to be covered by their rate minimums. You cannot be on Broadway without being a AEA member. Non-union extra work can pay nothing or as little as $60/12 hours.