Qadha Salaah Fajr and Asr

Q:

  1. The prophet (Sallallahu Alayhi Wasallam) prohibited us from reading Salah after asr, so why are we allowed to do qadha namaz after asar and after fajr?
  2.  If one misses witr at night can we do qadha in the morning. If yes why because time has finished for witr at Dawn?

Assisting one another

Q: For rotating money in the business, one person will be collecting a fixed amount from the 10 persons for the 11 months (including himself). Each month he will gather the entire amount and for the first month he will take the entire amount himself. For the remaining months, whoevers turn its is will take whole collected amount and the first person will take a small amount of commission (fixed amount) as the maintenance charge of this system. Is this system allowed in Islam? Is the commission amount interest?