interest money

Receiving interest on a loan

Q: My friend is asking me for Rs.100 for a business and he is telling me that he will give me the money after 1 week along with 2.3% of the Rs.100, that is after 7 days he will give me Rs.116. Can I take this Rs.116 or is it haram?

Moreover he is telling me how much you give me I will give you after 7 days with 2.3% of your invested money. Please clarify, if it is halal I will proceed otherwise I will not.

Using interest money to pay off interest from a bank

Q: My father started a business, but after some time, one of his staff engaged in fraud, causing the business to become bankrupt. Now, because my father owes money to many customers, he took a loan from the bank to pay them back. However, this loan is accumulating interest which my father will have to pay to the bank. Can I use the interest money that accrues on my account which is separate to my father’s account, to pay the interest amount that my father owes to the bank?

Using interest money for medical treatment and constructing toilets

Q:

1. Is it permissible to take money from an NGO or Charitable trust for medical treatment (Person who needs the money isn't capable enough to manage the expenditure)

2. Can we use interest money (Savings Bank account) for medical treatment of poor people.

3. Is it permissible to use money from interest received from a non Islamic bank for the purpose of construction of his/her own toilet.