Graph to Represent How Influences Impact Fixed Related Factors in a Measure

What is the best way to represent the following formula as a graph?

Overall Score = 70% × [ 50% × Sub-factor A + 20% × Sub-factor B + 5% × Sub-factor C + 25% × Sub-factor D ] + 30% × [ 15% × Sub-factor A + 50% × Sub-factor B + 10% × Sub-factor C + 25% × Sub-factor D ]

For example, if: Overall Score = 70% × [ 50% × 44% + 20% × 3.75% + 5% × 14.4% + 25% × 20.5% ] + 30% × [ 15% × 10% + 50% × 10% + 10% × 16.67% + 25% × 25% ]

Then, one way of possibly representing the data would be this way:

A pie chart with three layers; outer later is labelled "Overall Score" and represents the evaluated value of the formula previously mentioned; the 2nd inner layer shows the two fixed factors A and B with their fixed influences, 70% and 30%, respectively; and under each arch of the previously mentioned inner layers are sub-layers, representing the sub-factors, broken down to either completely fit or fit partially within the arches of the parent layer.

(Note that if all sub-factors were 100% then the graph would be completely filled with no grey areas under factor A and factor B.)

However, is it a good graph? What are the pros and cons of this approach? And it is the best graph to use for the formula provided? Could a different graph work? Or is a graph even necessary?

Thanks for your feedback.

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