coal from source a produces sulfur at a rate of 18g per 100kg of coal. coal from source b produces sulfur at a rate of 42g per 275 kg of coal. source a sells coal for $0.60/kg and source b sells for $1.40/kg. a. how many grams of sulfur would be released from the combustion of $100 of each source of coal? (round to the nearest tenth)