Add 8$ to my total

Hi Simple command button, but not too sure what formula is going to work in there.

I have 8 rows, 8 buttons, everytime I press the button it should add 8$ to my row total.

Private Sub Add306_Click()
Range("E9").Select
    ActiveCell.FormulaR1C1 = "=+8"
End Sub

What's the code doing wrong?

Or

Private Sub Add306_Click()
    With Range("E9")
        .Value = .Value + 8
    End With
End Sub