Working as a teller in the bank

Q: I have a job interview working for a bank in the USA. I was told that it is haraam to work for an American or foreign bank because they deal with interest rates (RIBA). However when I work there I will be at the cashier, depositing the clients money in their account, not directly with riba. Please advice if this is haraam or halaal?

Khilaal of the toes

Q: Regarding khilaal of the toes, should one make khilaal of the toes of both feet together after washing both the feet or should one make khilal of the toes of the right foot after washing the right foot and of the left foot after washing the left foot? What is the sunnah method?

Lowering the back for ruku' and sajdah when performing salaah while seated on a chair

Q:

  1. When performing salah sitting on a chair do you leave your back straight and just move your head little for ruku and more for sajdah as mentioned in the video by the mufti saheb or you should move the back as well, because that's what I have seen people even scholars pray who are unable to do ruku and sajdah and the in a normal manner? Link: ...
  2. If the mufti saheb in the video is correct how is it for a person who is unable to do sajdah on the ground to move the back when praying sitting on the chair or on the ground?