REGARDING UNSECURED LOAN AND INTEREST

1. There is no rule for limit with respect to the loan amount. 
2. It depends on the nature of the business you are doing.  
3. And interest rates are based on banks and normally unsecured loans carry a high rate of interest. 
Please correct me if the above solution has an alternative view. 

1. Of course, without payment of interest which bank will provide a loan.