Right-click on the sheet concerned's tab and choose View code, then paste the following to where the cursor is flashing:
Code:
Private Sub Worksheet_Change(ByVal Target As Range)
If Not Intersect(Target, Range("A2")) Is Nothing Then
With Range("A3:A10")
.FormulaR1C1 = "=R[-1]C*(1+6%)"
.Value = .Value
End With
End If
End Sub
Sub Belle()
Dim cells As Range
For Each cells In Range("A3:A10")
cells.Value = cells.Offset(-1, 0).Value + cells.Offset(-1, 0).Value * 6 / 100
Next
End Sub