On all bills for taxes for municipal purposes for real estate, chattels real, and personal property levied and imposed for a taxable year, the Director of Finance shall allow a discount of 0.5% if paid on or before July 31. City Code, 1927, art. 46, §43 1950, art. 37, §43 1966, art. 28, §41 1976/83, art. 28, §11 Ord. 27-196 Ord. 47-109 Ord. 48-538 Ord. 49-900 Ord. 55-1381 Ord. 59-024 Ord. 60-429 Ord. 66-794 Ord. 68-041 Ord. 69-357 Ord. 10-339