# Online PIE GRAPH tool with fixed and variable inputs

I have the following problem, let's assume I have these variables:

A
B
C
D = (G + H + I)
E = (L + M + N + O)
F

BUT WHERE N = 50% of O and L = 3% of N

and A + B + C + D + E + F = TOT

I would like an interactive online graph tool that could help me to fix some of these and fastly change the others, or if I modify the total, have all of them changed accordingly scaled up or diminished keeping the relative % but scaling the value.

eg. let's assign a scalar value like A = 5, B = 7%, and a tot of 100 the system will show something like C+D+E+F = 88, but if I pick also M = 9, it will say C+D+F+L+N+O = 79, then if I will change the TOT actually from 100 to 120, A will stay stable to 5 but B being 7% will not be 7 anymore but will increase accordingly.

I'm up to write a mathematica script in order to do that, but I'm pretty sure someone wrote already a graph tool for it that could be lot more interactive than what I could do for mathematica by myself ^^

If you are wondering what it could be about, it could be very useful if you have to estimate for example a product cost while considering lot of other input variables that could be fixed costs or instead something else that could changes related to the % with the final TOT.