Where any Tribunal makes an order for maintenance made under this Act, such Tribunal may direct that in addition to the amount of maintenance, simple interest shall also be paid at such rate and from such date not earlier than the date of making the application as may be determined by the Tribunal which shall not be less than five per cent. and not more than eighteen per cent.:

   Provided that where any application for maintenance under Chapter IX of the Code of Criminal Procedure, 1973 (2 of 1974) is pending before a Court at the commencement of this Act, then the Court shall allow the withdrawal of such application on the request of the parent and such parent shall be entitled to file an application for maintenance before the Tribunal.