My concepts

So this is what I have bin working on.

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The first one:
The length of the arc depends on the data set. So the more money is spend the longer the arc will be.

The second and the third have the same concept. The differnce is that the whole arc is growing now. Also the line weight is getting bigger. They are set with a transparency so that you can see all of the sets. The third one has a small change in the design to make it more clear i've added a percentage bar.