VBA/Macro which can multiply 2 columns and output is in the third column

Need help on how to create a macro which can multiply 2 columns and the output will be in another column.

e.g.

Column 1 Column 2 Column 3
1 5 5
1.5 8 12

I have attached a sample snapshot on this. May sound simple for others, but I am a new user.
Appreciate all the help!

Something like

With Range("f2",Range("f" & Rows.Count).End(xlup)).Offset(,2)
     .Formula = "=rc[-2]*rc[-1]"
     .Value = .Value
End With

Sub multiple()
Dim x, i&, LR&

 LR = Cells.Find("*", , , , xlByRows, xlPrevious).Row
For i = 1 To LR
    Cells(i, 3) = Cells(i, 1) * Cells(i, 2)
Next
End Sub