You forgot about capacity

[51.0, 41.2, 0.81, 2] => 100-51==49 (1)

[25.6, 17.8, 0.69, 1] => 49-25.6==23.4 (1)

[27.8, 19.0, 0.68, 4] => 23.4<27.8 (0)

[11.2, 7.4, 0.66, 0] => 23.4-11.2-11.2==1 (2)

[23.9, 15.6, 0.65, 3]] => 1<23.9 (0)