A coal has 10% moisture, 39% volatile matter and 41% ash. Calculate % volatile matter and % fixed carbon on (dry, mineral-matter free) dmmf basis and determine the ASTM Group to which the coal belongs. Table 2: Characterization of different types of coal TYPE OF COAL VOLATILE SUB-TYPE FIXED CARBON CALORIFIC (%wt) MATTER (%wt) VALUE (MJ/kg) Anthracite Meta-anthracite over 98% < 2% Anthracite 92-98% 2-6% Semi-anthracite 86-92% 8-14% Bituminous Low-volatile 78-86% 14-22% Medium volatile 69-78% High volatile A 22-31% > 32.5 High volatile B < 69% > 31% 30.2-32.5 High volatile C 26.7-30.2 Sub-bituminous A 24.4-26.7 < 69% > 31% 22.1-24.4 C 19.3-22.1 Lignite A. 14.6-19.3 < 69% > 31% < 14.6