Help with Acrobat 7 Pro (making savable Reader PDFs and making columns do math)

Question

Do forgive me as I normally don't make interactive PDFs, but I need to know a couple of things.
I'm using Acrobat Professional 7 at home, but have access to Pro 8.  In 7, show do you make the PDF save info along with the PDF in Adobe Reader?  I've seen how to do it in Pro 8, which allows 500 hits to the file, which is plenty fine for the use for the forms I'm making.  But in Pro 7, I cannot not find this feature to let Reader save filled in form fields.
Now the attachment to my post is the second (but not as important) issue.
I need to try and make the fields on this form do adding, subtracting, and multiplication.  How do I do that?  I have no java programming experipence.  Here is how I want the columns to work:
Texts 29, 34, 39, and 44 should add up in Text 46.  Texts 30, 35, 40, and 45 should add up in Text 47.
Text 48 should subtract from Text 46 and Text 49 should subtract from Text 47 if used.  The results should then show in Texts 52 and 53 respectively.
Now here's the tricky bit.  Texts 50 and 51 are optional.  If the senior discount is applied, then Texts 52 & 53 should have a 5% discount applied to the totals.
Is this doable by a non-programmer?  Any help is greatly appreciated.
Bill Rudloff

Answer 1

So the Feature can not be invoked by Acrobat 7 but is availble if turned on in Reader 7.
The OP said he had 7 at home but access to 8.  So depending on whether Micahel was addressing Acrobat or Reader his answer can go either direction. The ability to do is in 8 and 9 Acrobat. And 7, 8, 9 Reader is able to use it.
As I phrased my comment after Michaels I defered to his expertise. And was adding the additional comments that  Reader 7, 8, 9 can use it . But only 8, 9 Acrobat can invoke it.
So we are all correct to a degree.