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The Federal new source performance standards for coal-fired power plants require that the emissions of nitrogen oxides be less than 0.6 lb of nitrogen oxides per million Btu of coal burned. These are to be computed based on all the nitrogen oxides being in the form of NO 2 . If a plant emits 0.4 lb of NO and 0.1 lb of NO 2 per million Btu, what is its nitrogen oxide emission, reported as NO 2