how can add some signs for example '%'

hello,I want to get percentage,likes ed[=c4/c3*100], how can I add ‘%’ behind it?

Please, try to use setNumberFormat() method:
docs.dhtmlx.com/doku.php?id=dhtm … mberformat

For example:
mygrid.setNumberFormat(“00.00%”,colInd,".",",");

thank you! I have solved it.