What is a billing unit in terms of cubic feet?

The term "billing unit" in the context of water utility services typically refers to a standardized quantity of water used for billing purposes. The correct definition establishes that a billing unit is a measured quantity of water equivalent to 100 cubic feet. This standard allows for consistency and clarity in billing practices, ensuring that both the utility provider and the consumer clearly understand how charges are calculated based on usage.

In many municipalities and utility companies, billing is structured around this unit because it simplifies the process of tracking water consumption and calculating charges. When customers receive their bills, the amount of water they have used is often reported in terms of billing units measured in hundreds of cubic feet, making it easier to compute total costs for the volume of water consumed.

The other options do not align with the standardized understanding of a billing unit in the utility industry, which confirms the correctness of identifying it as 100 cubic feet.