How to treat a loan from a friend?

Ankit Manocha (MBA) (40 Points)

12 May 2017  
I want to borrow an amount for my business from a friend at a particular ROI. Please let me know 1. How will I treat that into my accounts? 2. How will my friend treat the same in his ITR? 3. How the repayment is treated by me and my friend? 4. Whether my friend is taxed on Interest amount or on Principle + Interest?