Is there a term for a tree where the values of the children add up to a fixed value?

I have a tree with percentages of the following form

        100
/   \
/     \
/       \
/         \
25          75
/  \       / | \
15  10    35  10 30
/  \      / \
1    9    5   5
/ | \
3  3  3


So child nodes are added up in the parent node.

Does a tree with this attribute has a already defined name in the algorithmic world?

Thanks for the positive feedback so far.

In this case the nodes hold actually values which are added up in the parent and the example tree shows the percentages of these values in comparison to the root.

I have to implement an algorithm to find those nodes which have the biggest impact and add up to 95 percent.

Since the problem description in case what "biggest impact" means, is pretty open I was thinking about setting the percentage in relation to its child nodes + itself.

Therefore node 25 would have a weight of 25/8, node 75 would have on of 75/6 and so on.

In the next step I would order by weight, min amount of children, in descending order and add up the percentages of the nodes until I reach 95 percent. Always removing a sub node from the result when the parent is added.

I hope I could make myself clear