Interest on tds

As per 201(1A)(i) of IT Act, Pay simple interest at one per cent for every month or part of a month on the amount of such tax from the date on which such tax was deductible to the date on which such tax is deducted;

3% interest (1% for 3 Months)

Interest - 3% in your case

Tax Deductible Date to Tax Deducted Date  - 1%

Tax Deducted Date to Tax paid Date  - 1.5%

In your case both Tax Deducted Date and Paid date is same