Scoring for AP Euro

Does anyone know what the scoring factors have been historically for the AP Euro exam? I understand that the scoring is something like this:</p>

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where A and B are constants used to scale the two section scores to be proportionate. I know that the recent change to not count wrong answers will have changed those factors, but does anyone know what they have been in the past?</p>

I think Euro is out of 180 Raw points. Each section is worth 90. Thus, scale each section to 90 points and add them. Much easier than memorizing the factors.</p>