58. calculate the volatile matter dry ash free basis if moisture content of a 2 points coal sample is 16.5% and ash is 2.3%, and volatile matter is 67.5%. (roun

58. Calculate the volatile matter dry ash free basis if moisture content of a 2 points coal sample is 16.5% and ash is 2.3%, and volatile matter is 67.5%. (round off to 2 decimal places)