(a) A governmental body, as defined in section 103D-104, that enters into a public works contract under this chapter having an estimated value of not less than $250,000, shall decrease the bid amount of a bidder by five per cent if the bidder is a party to an apprenticeship agreement registered with the department of labor and industrial relations for each apprenticeable trade the bidder will employ to construct the public works, and in conformance with chapter 372. The lowest total bid, taking the