Annually, before September 1st, the city legislative body shall fix the rate of taxes, or rates of taxes, if different portions or districts require different rates, by determining the percentage of full value on the assessment roll required to raise the revenue authorized by this article, using as a basis the value of the property as assessed and equalized. The rates shall be sufficient to raise the amount fixed by ordinance or resolution and the expense of collection. The city legislative body shall immediately transmit to the county auditor a statement of the rates fixed.