Sale of different currencies

Q: I am a collector and I collect banknotes from various countries. A few days ago, I bought a few foreign banknotes online from a website, I paid the amount and a few days later, the banknotes were delivered to me. Was this transaction haram as the purchase was not done hand to hand? And if it was haram, what am I required to do?

Performing salaah behind imaams who shave their beards or wear their pants below the ankles

Q: I am living in Canada and perform salaah in a masjid or musalla where sometimes the salah is led by an Imam whose pants are below his ankle or someone has no beard and I don’t have any other choice. This happened once in a while. Do I have to repeat that salah after the jamaat or will it be okay? If I have to repeat the salah then I can repeat it in the future if this one happens but what about the past salah that I don’t know how many it was.

Muslim woman working

Q: I am a 19 year old Muslim female. I want to do a vacation job because I am on holiday from university. I will be working in a ladies only environment, doing administrative work. I live with my retired grandparents and younger sister. My parents are deceased.

Is it permissable for me to take this job to earn extra pocket money and to build up experience that will benefit me later on?

Favouring a contractor who is one's friend after closing a tender

Q: 3 Companies were invited to construct a building. They were invited which would mean that they are all of equal stature. We were all in by the client prior to the tender closing and where the client advised us of his needs. We received the tender results but were advised a few days later that all three prices were too high for the client. I asked asked if we could assist and negotiate with the client to lower our price to come in line with the client. We were then advised that the client had negotiated with the company that had the highest price. It is common knowledge that the client and this contractor are friends and possibly family. Is this Nepotism and is this allowed in Islam.

Earning by investing some money by liking and subscribing to different YouTube channels and uploading them to an app

Q: There is an online app in which you get a daily job by investing some money by liking and subscribing to different YouTube channels and uploading them to the app. It gives daily money on account of investment. Like invest 15000 rs and have to do 10 daily tasks and get 600 rs daily. Is it halal?