(a) The board may impose the tax at a rate not to exceed the limit approved by the voters at the election authorizing the imposition of the tax.
(b) The tax rate for all purposes may not exceed 75 cents on each $100 valuation of all taxable property in the district.

(c) In setting the tax rate, the board shall consider the income of the district from sources other than taxation.
(d) An appointed director may not vote on the adoption of the tax rate to be set by the board.