Calculated non-base table field in a tabular form

I am struggling with creating a non-base table calculated field in a tabular form in ApEx 3.1
Can you point me in the right direction
I thought this would be fairly easy to do, but I cant work out how to do it
Requirements
1) Tabular Form based on a table with QTY and PRICE columns
2) TOTAL is a non-base table field, based on QTY * PRICE
3) If the Qty or Price changes, the TOTAL should be re-calculated
Example
QTY   PRICE TOTAL
===    ===== =====
3       5          15
10      50         500
20      3           60
Environment
ApEx 3.1, Oracle 10 and Oracle 11 databases
I recommended to upgrade to a newer version of ApEx but the request was rejected so Im stuck with 3.1

Thanks, but its not the solution that I am after
I am looking for a solution that will ...
1) not require the calculated value TOTAL to be stored in the table
and 2) re-calculate the TOTAL when I modify the dependent values (QTY and PRICE) before I save the changes to the database
I am still looking for a solution if anyone can help

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Calculated non-base table field in a tabular form

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