Populate textbox with radio box output

Question

I have 2 sets of 5 radio boxes.
Set 1 - CHESTQTY
option1 - 100
option2 - 200
option3 - 300
option4 - 400
option5 - 500
Set 2 - BACKQTY
option1 - 1100
option2 - 1200
option3 - 1300
option4 - 1400
option5 - 1500
Basically I'm making an order form. When a user selects any option from the CHESTQTY radio box set, I need to output a specific number to a TOTAL box. The total is always $35.00 for any option selected from CHESTQTY.
But, they also have an option of also selecting from the BACKQTY radio box set. They are required to select at least a CHESTQTY but are not required to select a BACKQTY. But if they do select a BACKQTY also, I need to add an additional $85.00 to the previous $35.00.
I'm kind of new to Javascript, but a total rookie when it comes to Javascripting in Acrobat. I've searched the web forever and cannot find anything like this.
What it comes down to is this:
CHESTQTY is required. Adds $35.00 to a text box if any of the options are selected.
BACKQTY is optional, but if selected, also needs to add $85.00 to the previous $35.00.
Can anyone help with this?

Answer 1

If I understand what you're trying to achieve, the custom calculation script for the text field could be:
// Custom calculation script for text field
(function () {
    // Get the field values
    var v1 = getField("CHESTQTY").value;
    var v2 = getField("BACKQTY").value;
    // Create a variable for the sum
    var sum = 0;
    // Add 35 to the sum if any of the radio buttons is selected
    if (v1 !== "Off") sum += 35;
    // Add 85 to the sum if any of the other radio buttons is selected
    if (v2 !== "Off") sum += 85;
    // Set this field's value to the sum
    event.value = sum;