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Ah, we’re both right.
I assumed that the tax would result in whole numbers but upon further inspection (i.e. trying it out it in a calculator) it turns out that few prices would result in values that don’t have overhanging millidollars.
The solution is obviously to force prices to be whole dollar and to further allow sale taxes only in increments of 5%.
I’m not sure whether that difference is statistically significant though since there are only a couple of left sources included.