Here another variant:
$iNumber = 500
For $i = 100 To 700 Step 100
If ($iNumber / $i) <= 1 Then
Call("Func" & $i / 100)
ExitLoop
EndIf
Next
Func Func1()
MsgBox(0, "Function1", "< 100")
EndFunc
Func Func2()
MsgBox(0, "Function2", "> 100 to <= 200")
EndFunc
Func Func3()
MsgBox(0, "Function3", "> 200 to <= 300")
EndFunc
Func Func4()
MsgBox(0, "Function4", "> 300 to <= 400")
EndFunc
Func Func5()
MsgBox(0, "Function5", "> 400 to <= 500")
EndFunc
Func Func6()
MsgBox(0, "Function5", "> 500 to <= 600")
EndFunc
Func Func7()
MsgBox(0, "Function6", ">= 600")
EndFunc
Br,
UEZ