VBA Code Needed for a certain formula in Excel


Job Description

I need a VBA code in order to create a macro, that runs in excel 2010.
I have an excel sheet, and I am trying to bring some sort of automation in to that sheet (since I use it quite often) with the help of macros. The fact is that I am really new to macros and VBA programming language, so I need a little help in writing the code to find the 10th percentile for each bin value (50, 100, 150).
For a VBA expert it will take an hour or so to work things out, and the code that is needed is not too complicated as well.
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Skills: visual-basic