Crumbling Scoria

1 79 x 0.202 = 36.158

0.202

80 85 x 0.002 = 16.17

0.002

x 0.004 = 0

0.004

x 0.004 = 0

0.004

x 0.003 = 0

0.003

x 0.003 = 0

0.003

x 0.007 = 0

0.007

x 0.191 = 0

0.191

x 0.003 = 0

0.003