about interest calculation

in the assessment year 06-07 a client's total income was 868867 and the client filed his return of income on 29th july 2006 and he paid a tax of rs 221154 . This case was taken for hearing by the ITO and he imposed an addition of rs 19393 . so wats the amount of interest he should pay after making an addition of rs 19393. wat is the amount of interest should he pay on  sec 234-b and 234-c. pl do help