If any tax levied by this subchapter becomes delinquent, the person responsible and liable for such tax shall pay a penalty of 10% on such unpaid tax and shall pay interest on such unpaid tax at the rate of 1.5% per month on the unpaid balance from the date of delinquency until said unpaid balance is paid in full.
(Prior Code, Ch. 7, Art. 4, § 74)