A trustee acting in a fiduciary capacity, as herein authorized, is entitled to receive such compensation or commission as provided for in the trust agreement or other contract. If the amount of such compensation or commission is not regulated by or stipulated in the trust agreement, the trustee may charge and deduct a reasonable compensation or commission for the services rendered and the responsibilities assumed. Where the trustee is acting under appointment by a court, such compensation or commission shall be paid, irrespective of the provisions in the trust instrument, as allowed or approved by that court.