Different cash and credit price

Q: Is installment business halaal or haraam in Islam. Explaination: Company XYZ purchasing Product from Market in 1000 Rs. and Sell it on 2000 RS (double Rate) in 20 installments (100 Rs per day). One recory man is reserved for it for Recover Payment from Buyer Shops. (Recory man Salary is about 15000/month) But ON Cash Payment, Company Sale Same Product in (1500 RS). Is this type of business is halal or Haram in Islam.

Uncle representing the girl

Q: I would like to know is it possible for a girl to take her uncle or any other guy relative as her wali while her father is alive? People in my place where I live tell their daughters when the mufti ask you who is your wali then tell him your uncle, etc. So during nikah the girl takes someone else as her wali instead of her father. And that also when the father is alive living with the girl and happy with the marriege? Is this kind of nikah valid? In Islam is this permissible or is it just a cultural thing? I am really confused. I heard in proper Islamic nikah, the wali must be the girl's father unless he is dead.

Moving away from wrong company

Q: When I'm with people and they talk too much about dunya, like what's on sale, or politics, what is latest etc, why do I feel that my heart is kinda in pain? Like I don't like hearing it and I wish I could just close off and leave. I can't tolerate it at all. And this happens with my relatives a lot. Shouldn't I have sabr? I just sit there and just keep feeling sad inside. It's like I really hate people doing that. I feel like my heart burns or something. I'm scared of being absorbed into dunya by listening to people's talk.

Graphic designing

Q: I am a graphic designer by profession. In my line of work, I have to prepare advertisements for my clients. The adverts have the pictures of the products which are on promotion. Invariably, some products that are advertised have pictures e.g. Milo – the picture of the tin has a picture of a youngster kicking a football. My clients will want the picture of the Milo tin on the advertising pamphlet. In the circumstances, will it be permissible for me to put the photographs of the products on the pamphlets which are solely used for advertising purposes?