How could be calculate only result for cummulative value in Webi level?

Hi Expert,

I have to requirement on webi level only result calculation

scenario below like that

Company code            % X

100                      10

200                      13

300                      15

Result           = only cummulative   (not sum eg 38)

So how could be achieve  only this result value ??

Pls advice

Regards

Waseem