section 234A deals with interest on delay in filing of return. if you file before 31/07/2010. then no interest @ 1%per month or part thereof will be levied.
section 234B levies interest on shortfall of payment of advance tax.if you pay atleast 90 % of your tax liability by way of advance tax. after considering tds. no interest @ 1% per month or part thereof will be levied.from april1 to filing of return
section 234C deals with deferment of advance tax ,ie if advance tax by way of instalment is paid less than 30 %, 60%,100% before 15th sept,15thdec &15th mar respectively then interest @ 1 % per month or part thereof will be levied
so no interest in your case.simply pay the self assessment tax