Loop through certain cells column

Hello people I hade made following code but I dont get it work,

I want to loop through the whole column,
then take the each cellvalue from column "L" *1.35
put the new result same row but column K




I got this code so far

Dim ws As Worksheet 
 
 
For Each ws In ThisWorkbook.Worksheets 
    Dim c As Range 
     
     
    For Each c In ws.UsedRange.Columns("L").Cells 
         
         
        Dim mycell As String 
        Dim nomatchfom As String 
         
        mycell = c.Value 
        nomatchform = 1.35 
         
         
        myresult = Val(mycell * nomatchform) 
         
        MsgBox myresult 
         
    Next c 
Next ws