Refer to the attached file for tax calculation & tax payment.
You need not pay any interest on the tax amount (untill & unless you are paying tax & filing your return before 31st July,2012).
Also, don't forget to add your 'Interest income from saving bank a/c's' to the 'Income From Other Sources' head.
If you have made any investments, like : U/s.80C (LIC, PPF, PF included as deduction in salary, NSC, etc.), U/s.80D (medicliam), U/s.80G (donations), etc.; you will be eligible for deductions for the invested amount (limits applicable).
This might reduce your tax payment or you may not have to pay tax at all.
Feel free to ask again if there's still doubt.