Calculation based on radio box Help PLEASE....

Question

I am trying to make a text box perform a calculation based on whether or not a radio button is checked or not.
If the radio button named "Basting" in the "Quilting Type" group is checked then the text box "Basting Charge" should find the value of the "Total Square Inches" field and  multiply that total by 0.015 and show the new total in the text box as a dollar value, if the radio button "Basting" is not checked the value in the "Basting Charge" field should be "-0-".
I can get the calculation I want from this:
var v1 = getField("Total Square Inches").value; event.value=v1*0.015;
but how to include the radio button function and the "-0-" ?

Answer 1

Okay, I have now made a "check box" with the name of "Basting", not in a grouping.
This is the set up:
Text Field = Total Square Inches
Check Box = Basting
                                   Export Value = Yes
Text Field = Basting Charge
Calculation for "Basting Charge" should be "0" unless the "Basting" check box is used, then it should get the value of the "Total Square Inches" and multiply that number by 0.015 and show this value in the "Basting Charge" box displaying as a dollar figure.
So if the value in the "Total Square Inches" is 12,000
and the "Basting" check box is used
The "Basting Charge" should read "$180.00"
if the check box is not used then it should read "-0-"