digraph weight_tree{
node [shape=box color=lightblue,style=filled];
 
all [label="All items",xlabel="100"];
t1 [label="Part 1",xlabel="75"];
t2 [label="Part 2",xlabel="25"];
p1 [label="pPart 1",xlabel="50"];
p2 [label="pPart 2",xlabel="50"];
p3 [label="pPart 3",xlabel="50"];
p4 [label="pPart 4",xlabel="50"];
all -> t1 [label="75%"];
all -> t2;
t1 -> p1 [label="20%"];
t1 -> p2;
t2 -> p3;
t2 -> p4;
}