Hello everyone I have a long time to program and I would apreciate if you could help me.

I need to write a simple html form.

My form looks like this:

integer variable a11=1
integer variable a12=2

(1) Textbox User Input Integer
(2) Textbox User Input Integer
(3) Textbox fixed non editable value 15%
(4) Dropdown Yes/No

If (4) = Yes then Total = (1)*a11
If (4) = No then Total = (2)*a12

Thanks