Pro Tools 9 can be expanded to 256 tracks of playback (assuming you have a computer fast enough to run that many) using the Complete Production Toolkit.
192 meters long.
192
192
192
192
1923 = 192 x 192 x 192 = 7077888
1*9+2*90+3*1=192
A lot !!
192 of them. Get extra for breakage.
75% of 192= 75% * 192= 0.75 * 192= 144
192
10% of 192 = 10% * 192 = 0.1 * 192 = 19.2