Accepting payment from financial institutions

Q: We have a company selling computers with Muslim and non-Muslim customers.

Some customers require financing/loans (which comes with interest) through third party financing institutions to buy the equipment from us.

Firstly, is it permissible for us to accept the payment from the financial institution on their behalf? We are not engaging in interest but we have to be registered as an authorized supplier with the institution.

Secondly, as some Muslims also tend to go through the same system, we want to provide an in-house interest-free financing facility for our Muslim customers only so that they do not have to pay interest and get a short-term facility on their purchase from us. Can we make the credit price higher than the cash price? For example, if R100 is the cash price, can we charge R125 for credit term over 6 monthly instalments?

Blowing in water

Q: Whenever I recite holy quran, I blow breath on drinking water, on my husband and children. I have noticed this whenever I do dum, in those days my husband become ill, restless, feeling body ache and his sleep become disturbed. When I stop reciting Quran, he is feeling good in those days. I don’t know why?

Travelling without a mahram

Q: Is it ok to let my wife accompanied by my three sons, the oldest age is 5 years old, to take taxi as transport to some places where it's quite far and there is a need to go there. The issue is because the driver is non mahram male and I can't accompany my wife because I'm working in the office in the daytime. She can use public buses but a little bit troublesome because she has to take care of the baby trolley and sometimes no seat available?

The book Shamsul maarif

Q: I saw a video on youtube when searching for info about the book ''shams ul maarif''. I think the person in the video claims that he is moving bottles with the help of the instructions from the book of shams ul maarif with a jinn? What do the ulama say about this book? I saw that there is a fatwa of Shaykh Ibn Jibrin about this book.