From Le Vieux Lapin, this is probably not an overall-CIDU: notice the classic joke structure, with setup in panel 3 (along with 5) and the payoff in the final one. But along the way there are several bits which can stand in need of explication, for different readers.
For instance, I have never run into pay-as-you-go gas meters in real life (for tenants to get heat or hot water), but sort of know about them from vintage British movies and some novels. (Though it says a quarter and not a shilling so this may be American.) Maybe somebody understands them better — is electricity paid for this way anywhere? And the Patreon structure of “levels” — is this known widely outside of Patreon users? And does the girl’s litany of questions come from anywhere else in this wording?