Keeping the qada fasts of another person

Q: My mother, 58, is diabetic and a high bp patient. Contrary to the doctors advice, she observes the Ramadan fasts, alhamdulilah. However, in her young days, she casually skipped many fasts and accordig to her estimation she has skipped around 200 fasts. Given her present condition (Allah bless her with health and life) she might not be able to makeup for those fasts herself in her life.

I know that a son can observe/makeup fast for their parents after their death. Can I observe those missed fasts for her in her life too? If yes then can I now make niyat for my past nafal fasts to make up for her numbers? If initially its a no then would paying only fidya be enough for making up? Please guide on this matter.

Credit price higher than cash price

Q: Wholesalers often sell to retailers large stocks on a credit period and for this credit period they often charge a little higher price for the stock then those making cash sales. It is clear that retailers purchase big stocks and cannot pay for that upfront and often prefer to purchase on credit. Does that little higher price charged for the credit period amount to interest? A house hold appliances wholesale business is in question.

Woman working during iddat

Q: I want to ask about khula. I have taken khula about 4 days ago. My husband lives in Australia and he is not with us for the last 16 months. I started working in December and I am in my probation period because of which I am not allowed to leave. If I leave the job then it will be difficult for me to get another job as I am a mother of a baby boy. This is my source of income so that I can pay for his school and other expenses in future. Kindly guide me according to my whole situation.

Umbilical cord banking

Q: What does the Ulama say about umbilical cord banking? Nowadays some people from hospital take away the newborn childs umbilical cord by saying that it will be preserved and used for the same baby in case of any serious disease in the future. How is this right for society and upto what extent?

Keeping aloof from people

Q: I have social anxiety that has been growing since the past year ever since I moved to this new country as a student. The nature of my research-based program also "allows" me to work just by myself without having to go through daily social interactions, and besides I've never really felt comfortable hanging around with my colleagues. I wonder if it's sinful to do such social isolation, because I actually always feel guilty since I feel like I contribute to nothing to people's lives and my presence has no meanings in their lives (in which I always try to make up by doing more charities). I've always wanted to change but it's just so difficult to connect with anybody in this place, and right now I just look forward to finish my study and go back home soon to recover my "normal" life that I had in the past. How sinful it is and how can I make up for such bad habit in a way that doesn't make me uncomfortable all the time just like when I'm being surrounded by people?