Displaying Extra Characters With COLUMN-defined Number Format?

Here's a tricky SQL question that has definitely driven me to the end of
my rope. I'm using Oracle 9i and I need to perform some simple
multiplication on a field and then display it with a percent sign using
the COLUMN command. Here's the code thus far:

COLUMN price format 9,999.99 HEADING 'Charged%'
SELECT pricecharged * .231 as price
FROM VT_examdetail

The output from this reads:

Charged%
---------
23.10
34.65
34.65
....


The kicker here is that I need to add a percent sign to the right of the
output, so that it reads:


Charged%
---------
23.10%
34.65%
34.65%
....

I thought I could do this by just adding "|| ('%')" into the SELECT
statement, but when I do this the decimal position defined in the COLUMN
command is lost. Does anyone know another way around this?

Thanks,
Alex