Sub DD()
Dim c As Range
Lastcl = Cells(Rows.Count, "A").End(xlUp).Row
For Each c In Range("N2:N" & Lastcl).Cells
c.Value = WorksheetFunction.SumProduct(--(Range("M2:M" & Lastcl)), --
(Range("H2:H" & Lastcl)))
Next c
End Sub

above macro doesnt work please help