Percent Difference w/o A: How to Calculate

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Calculating percent difference inherently requires both values involved, typically represented as A and B. Without one of these values, particularly A, determining the percent difference becomes impossible, as it relies on knowing the reference point. The discussion suggests that the original question may stem from a misunderstanding of the assignment or concept. Clarification of the task or additional context may be necessary for proper calculation. Ultimately, percent difference cannot be computed without knowing both values involved.
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Which is ABS( A - B) / A * 100% = ANS
Anyway to do it without A? My proff says we should know it or be able to figure it out?
 
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I'm not sure I understand the question, because it looks like your 'proff' is pulling your leg.

When you calculate a percent difference, you're determining by what ratio one thing differs from another. I don't see any way to make that determination if you're missing one of the "things". It would be like saying "an elephant is how much bigger?" Unless you know "than what", there's not much you can say.

Is it possible you misunderstood what you were supposed to do? Do you have it written down anywhere?
 

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