The assessment rolls of the city shall exhibit opposite the property listed for taxation the total amount of taxes assessed against such piece of property so listed, but it shall not be necessary for the assessment roll to show what proportionate amount of the total tax levied against any particular piece of property is levied by virtue of the general ad valorem tax or several special taxes assessed and levied under the authority of the city; that is to say, it shall not be required or necessary that the city assessor shall extend upon the tax assessment roll the amount of taxes levied and assessed against the property by virtue of the general ad valorem tax, school tax, tax for interest and sinking fund or any other partial or special tax of the city, which partial or special taxes in the aggregate compose and constitute the total ad valorem tax levy of the city. (Code 1941, Art. 149-7)