20. Resignation and termination of an appointment. (1) The Minister may at any time terminate the appointment of the Chairman or any other member of the Appeal Tribunal if— (a) he resigns his office; (b) he becomes of unsound mind or otherwise incapable of performing his duties or managing his affairs; (c) he becomes bankrupt or insolvent; (d) he is prohibited from being a director of a company under any written law relating to companies; (e) he has been convicted of an offence, under any law, by a court in Malaysia; (f) he is guilty of serious misconduct in relation to his duties; (g) he fails to comply with his obligations under section 26; or (h) his performance has been unsatisfactory for a significant period of time. (2) The Chairman or any member may, at any time, resign his office by giving a written notice to the Minister. 21. Vacation of office and acting appointments. (1) The office of the Chairman or any member of the Appeal Tribunal shall be vacated if— (a) he dies; (b) he resigns or otherwise vacates his office before the expiry of the term for which he is appointed; or (c) his appointment is terminated. (2) The Minister shall appoint a person in accordance with section 17 to replace the Chairman or any other member during the vacancy in the office of the Chairman or any other member. (3) The Minister shall appoint a person in accordance with section 17 to act as the Chairman, or any other member — (a) during any period when the Chairman or any other member is absent from any duty or from Malaysia; or (b) if the Chairman or any other member is, for any reason, unable to perform the duties of the office. (4) The exercise of the powers, or the performance of the functions, of the Appeal Tribunal is not affected only because of there being a vacancy in the membership of the Tribunal. 22. Quorum for the Appeal Tribunal. The quorum for the Appeal Tribunal shall be formed by—