A tax due and unpaid under this article shall be a debt due the City. It shall be a personal obligation of the taxpayer, and shall be a lien upon all property used in the business or occupation upon which such tax is imposed. Said lien shall have priority over all other liens and obligations except those due the State of West Virginia and the United States. A penalty of five percent (5%) of the tax shall be added for any default for thirty days or less, and for each succeeding thirty days elapsing before payment, there shall be an additional penalty of one percent (1%).