The U.S. imposed 220% duties on Bombardier Inc.’s marquee jetliner after Boeing Co.complained that the Canadian company received unfair government help. Exporters of 100- to 150-seat Canadian aircraft received subsidies worth almost 220 percent, the Commerce Department said Tuesday in Washington. The U.S. will begin collecting preliminary duties to offset the public assistance, a move that would potentially upend Bombardier’s planned deliveries of …