On the fifth day of December of each year, at five p.m., all taxes then unpaid, except the last installment of the real property taxes, are delinquent, and thereafter the tax collector must collect for the use of the city an additional eight percent thereon; provided, that if they be not paid before the twentieth day of April next succeeding, at five p.m., he shall collect an additional three percent thereon. On the twentieth day of April of each year, at five p.m., all unpaid portions of the remaining one-half of the taxes on all real property are delinquent, and thereafter the tax collector must collect for the use of the city an additional three percent thereon; provided, that the entire tax on any real property may be paid at the time the first installment, as above provided, is due and payable; and provided further, that the taxes on all personal property unsecured by real property shall be due and payable immediately after the assessment of said personal property is made. (Ord. 24 §1, 1946).