Excel/Formula question.

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Tom, you have helped me off and on for the past 15 years, and I hope you can once more, in spite of my inability to frame the question well. If you can help me, I appreciate it greatly, and if not, that will not take away from the incredibly high admiration I have for you and your abilities.
I have a spreadsheet where a bunch of our production and material costs are added together, given a price per thousand pieces, and a profit margin is added to them. (that part of the equation is a bit  backwards in that if the margin cell says 80% it will apply a 20% margin, if 85%, then a 15% margin etc. What happens is, my boss says, "bump that price up 3% in June" and then, by trial and error I have to figure out what to change that 85% to in order to achieve an increase of 3% in the final price.
It would be clearer I'm sure for you to look at an example. http://kingfield.net/excel/formula-question.xlsx  Very safe, Promise. Thanks Tom.
Paul (the wooden fruit guy)

Answer
Paul,

In C1 I would put the formula

=C2/(1+A1)

so you divide the percentage in C2 by (the percentage in A1 + 1)

in your example   80.00%/(1 + 3%) = 77.6699029126214%

then 260/77.6699029126214%  = 334.75

Your original formula boiled down to (260/80%) = 325.00  so to test my answer I add 3% of 325 to 325 and that equals 334.75 verifying that dividing by  77.6699039236214% produces the result you want (as I understand your problem statement)

Hopefully that is what you wanted.

--
Regards,
Tom Ogilvy  
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Tom Ogilvy

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Selected as an Excel MVP by Microsoft since 1999. Answering Excel questions in Allexperts since its inception in 2001. Able to answer questions on almost all aspects of Excel's internal capabilities. If seeking a VBA solution, please specify that in your question itself so I give you the answer you want. [Excel has weak protection - if you are distributing an application, I don't answer questions on how to protect your project from your users.]

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Extensive experience.

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Master of Science (MS) degree Operations Research (ORSA)

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Microsoft MVP in Excel.

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