S. 271(1)(c) : Penalty-Concealment-Capital gains-Additional income offered before issue of notice under section 148-Additional income cannot be treated as concealed income-Honesty of assessee in disclosing mistake and paying differential tax before assessment would negate grounds for imposing a penalty-Deletion of penalty is affirmed-[S. 45, 131, 143(1), 143(3), 147 148]