Before entering into a public work contract, a public body shall require that the public work contract include a clause for payment: to a worker, of at least the prevailing wage rate; and to an apprentice, of at least the rate that the Council sets for an apprentice based on a percentage of the prevailing wage rate for a mechanic in that trade. A public body shall require bonds on public work contracts to guarantee the faithful performance of the prevailing wage rate clause of the public work contract.