If you use SimpleBills through your property, then each resident has a separate bill and a separate account. Residents are billed according to who is listed in the lease agreement, rather than by roommate percentage. However, you can find the percentage for your current invoice in the My Bill section of your SimpleBills account.
If you use SimpleBills on your own and the utilities are in your or your roommate's name, then you can view your bill percentage in the My Bill section of your SimpleBills account. Just click on the individual utility to see the drop down box with bill details!