How to set up immediate calculation when using fields

Hello,
forgive me for the apparently dull question (I assume it is so as I was unable to find answer for it on the forum).
I am making a fillable PDF form with Acrobat Pro 9 and I have this page with simple invoice that looks like this:
item_price_1 * no_items_1 = subtotal_item_1
item_price_2 * no_items_2 = subtotal_item_2
item_price_n * no_items_n = subtotal_item_n
TOTAL = sum(subtotals)
I set up the various fields and created the formulas using properties > calculation >
While the subtotals populates automatically as I clic anywhere in the PDF [after filling the item_price and no_items], the same cannot be said for the TOTAL field - it populates only after that I enter a character anywhere in the form, no matter where and no matter what (even a spacing character works).
However since this form has to be made public, the users will think that the formula doesn't work because they cannot see an immediate calculation of the TOTAL.
Ideally, I'd like the result to be shown immediately, but I could go also with a simple "click anywhere on the page to update the TOTAL".
Is there a way to accomplish this?
Thanks!

This is a very common problem.
You need to fix the form's calculation order (Forms - Edit Fields - Set
Field Calculation Order...) Make sure the total field calculates after all
the sub-totals.

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