Change Data list decimal value display as percentage with %

Hi

i have a data list with a column progress with decimal values between 0 to 1, i would like to user to see these as % upon viewing the data list. i have tried bean shell

return value * 100 + '%';

which does not show any data

how to i show values in format of 10%  when the data value is 0.1 etc...

any help is truly apricated

Thanks.