If any person fails to file any required statement within the time prescribed, or if after demand therefor made by the tax administrator he fails to file a corrected statement, the tax administrator may determine the amount of tax due from such person by means of such information as he may be able to obtain.

In case such a determination is made, the tax administrator shall give a notice of the amount so assessed by serving it personally or by depositing it in the United States post office at the City, postage prepaid, addressed to the person so assessed at his last known address. Such person may, within ten days after the mailing or serving of such notice, make application in writing to the tax administrator for a hearing on the amount of the tax. If such application is made, or if application is not made within the time prescribed, the tax administrator shall cause the matter to be set for hearing within 15 days before the City Council. The tax administrator shall give at least ten days notice to such person of the time and place of hearing in the manner prescribed above for the service of notice of assessment. The City Council shall consider all evidence produced and make written notice of its findings thereon, which findings shall be final, shall be served upon the applicant in the manner prescribed above for the service of the notice of assessment.