(3)The President or any other member of the Appellate Tribunal authorised in this behalf by the Central Government may, sitting singly, dispose of any case which has been allotted to the Bench of which he is a member and which pertains to an assessee whose total income as computed by the Assessing Officer in the case does not exceed fifty lakh rupees, and the President may, for the disposal of any particular case, constitute a Special Bench consisting of three or more members, one of whom shall necessarily be a judicial member and one an accountant member.