The chartered accountant or cost accountant so nominated shall, within the period of ninety days, submit a report of such audit duly signed and certified by him to the said Assistant Commissioner mentioning therein such other particulars as may be specified:
Provided that the Assistant Commissioner may, on an application made to him in this behalf by the registered person or the chartered accountant or cost accountant or for any material and sufficient reason, extend the said period by a further period of ninety days.
