S. 271(1)(c) : Penalty – Concealment -Survey-Agreed addition- Revised return- Burden is on the assessee to show that there was an omission or wrong statement in original return must be due to bona fide inadvertence or bona fide mistake on part of assessee and even if assessee agreed to addition with a condition that penalty could not be imposed, department is not precluded from initiating penalty proceedings- levy of penalty is held to be valid [ S.69B ]