Zakat

Cash zakat must be given in cash!

Zakat can’t be spent on such projects.

You have to give 2.5% of the value of today and you must repent to Allah and express sincere remorse as you are committing one of the major sins in Islam as dealing or assisting in RIBA is a major sin.

No, Zakat is given for Muslims only, however, you may give charity to non-Muslims if they are poor and deserving.

Yes. Only if you asked him for it and he refuses to give it back or apologizes for being unable to give it back, only in this case you don’t have to pay zakat until he returns it to you.

This is ok.

You can give her from the zakat.

Yes, you can!

Whatever is used for trading; selling and buying, cash, profit, and spreadable stocks, you must give 2.5% every lunar year on that.