How do I create a formula to calculate a reverse value...for example, I can calculate Cell A3 by taking 10 (value in A1) and subtracting 25% (value in A2) to get 7.5. Obviously the formula for this could be something like: =(A2)+(A2)*B2/100. However, how do I create a formula for Cell A3 to reverse calculate this equation to get back to 10?. (8 + 25% = 10)

To try to explain, let me give you a different example. In the scenario below, the value of cell A3 should be 8. I get this value by taking the value of what Cell A3 should be (8) and adding the percent of Cell A2 (25%) which would give me the value of Cell A1 (10). I would like a formula that can calculate what should be in A3 based on the values in A1 and A2.

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