Here is what I have so far (practice program):

Private Sub cmdCalc_Click()
If chk1 = 0 Then
txt1a.Text = txt1 * txtA
txt2a.Text = txt2 * txtB
txtAve.Text = Round((Val(txt1a) + Val(txt2a)) / (Val(txt1) + Val(txt2)), 3)
Else
txt1a.Text = txt1 * txtA
txt2a.Text = txt2 * txtB
txt3a.Text = txt3 * txtC
txtAve.Text = Round((Val(txt1a) + Val(txt2a) + Val(txt3a)) / (Val(txt1) + Val(txt2) + Val(txt3)), 3)
end if

It does work. The problem is that there is another check box option in my program (chk2).

Is there a way to include it with its function into this code. Something to the twist of:
If chk1 = 0 and chk2 = 0 then.....blah blah

something along those lines.
Not sure if this makes sense.

Thank you.