Compensation payable to guardians shall be based upon services rendered and shall not exceed five per cent of the amount of moneys received during the period covered by the account required by section 5905.11 of the Revised Code. In the event of extraordinary services by any guardian, the probate court, upon petition and hearing thereon, may authorize reasonable additional compensation. A copy of the petition and notice of hearing thereon shall be given the proper office of the veterans’ administration in the manner provided in the case of hearing on a guardian’s account or other pleading. No commission or compensation shall be allowed on the moneys or other assets received from a prior guardian nor upon the amount received from liquidation of loans or other investments.