Jack Simpson, contract negotiator for Nebula Airframe Company, is currently involved in bidding on a follow- up government contract. In gathering cost data from the i rst three units, which Nebula produced under a research and development contract, he found that the First unit took 2,000 labor hours, the second took 1,800 labor hours, and the third took 1,692 hours. In a contract for three more units, how many labor hours should Simpson plan for?