S. 271(1)(c) : Penalty-Concealment-No addition to the returned income-Making a wholistic view of factual panorama of case and circumstances, in which return for year could not be filed within stipulated time, it could be said that there was a reasonable cause, bringing case out of purview of Explanation 3 to 271(1)(c).[ S. 11, 12A, 12AA, 153]