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Need to loop a VBA - Macros Code in Excel 2010?

Hello everyone

I need to apply a loop to the following code such that the constant (50) in ActiveCell.FormulaR1C1 = "=IF(C[-7]=50,C[-8],"""")" is replaced by a variable that has the values depending on column M as shown in the picture. Furthermore I also want my code to progress downwards and fill all the empty places, depending on the adjacent row value in column n. Do I need to switch over to absolute reference?

The code is as under:

Sub Percentile()
'
' Percentile Macro
'

'
    ActiveCell.FormulaR1C1 = "Rough Work"
    Range("L2").Select
    ActiveCell.FormulaR1C1 = "=IF(C[-7]=50,C[-8],"""")"
    Range("L2").Select
    Selection.AutoFill Destination:=Range("L2:L124252")
    Range("L2:L124252").Select
    Columns("L:L").Select
    Selection.Copy
    Columns("AG:AG").Select
    Selection.PasteSpecial Paste:=xlPasteValues, Operation:=xlNone, SkipBlanks _
        :=False, Transpose:=False
    Columns("Q:Q").Select
    Application.CutCopyMode = False
    Selection.ClearContents
    Range("Q1").Select
    ActiveCell.FormulaR1C1 = "Percentile 10%"
    Range("Q2").Select
    ActiveCell.FormulaR1C1 = "=PERCENTILE(C[16],0.1)"
    Columns("R:U").Select
    Selection.ClearContents
    Range("R1").Select
    ActiveCell.FormulaR1C1 = "Percentile 25%"
    Range("S1").Select
    ActiveCell.FormulaR1C1 = "Percentile 50%"
    Range("T1").Select
    ActiveCell.FormulaR1C1 = "Percentile 75%"
    Range("U1").Select
    ActiveCell.FormulaR1C1 = "Percentile 90%"
    Range("Q2").Select
    ActiveCell.FormulaR1C1 = "=PERCENTILE(C[16],0.1)"
    Range("R2").Select
    ActiveCell.FormulaR1C1 = "=PERCENTILE(C[15],0.25)"
    Range("S2").Select
    ActiveCell.FormulaR1C1 = "=PERCENTILE(C[14],0.5)"
    Range("T2").Select
    ActiveCell.FormulaR1C1 = "=PERCENTILE(C[13],0.75)"
    Range("U2").Select
    ActiveCell.FormulaR1C1 = "=PERCENTILE(C[12],0.9)"
    Range("U3").Select
End Sub

You could find the Main Excel sheet here:
http://tinyurl.com/aqheuyp

Picture of Need to loop a VBA - Macros Code in Excel 2010?