>I may be missing a simpler way to do this. Perhaps I should create another column in the array, and use the assign method - every time I changed the value of the decimal, I could assign the new column a character value containing the percent plus the percent symbol.
>

If decide to go this route, keep in mind that you'll still want the third column to be the character column, and the fourth column to be the numeric one. I don't think there's a way to specify 3 columns in a list or column, but tell it to skip the 3rd column and display the 4th instead. This means that your business object needs to use the 4th column instead of the 3rd.

>I think I might be better off going to a grid where I can control the formatting of that particular column.
>

That's one possibility.