(a) The board may impose for the transit department a sales and use tax at a permissible rate that does not exceed the rate approved by the voters at an election under this chapter.
(b) The board by order may:
(1) decrease the rate of the sales and use tax for the transit department to a permissible rate; or
(2) call an election for the increase or decrease of the sales and use tax to a permissible rate.

(c) The permissible rates for a sales and use tax imposed under this chapter are:
(1) one-quarter of one percent; and
(2) one-half of one percent.
(d) Chapter 322, Tax Code, applies to a transit department’s sales and use tax.