And here she is coming back, proud as anything to have successfully bought a hot dog and returned with the appropriate amount of change.
Not pictured is Robin's indignation that her $0.10 did not buy her a hot dog. She was upset for quite awhile that Erin's money could buy food but hers could not. I have no idea where Robin found ten cents. Erin shared her spoils with Robin, so everything worked out in the end.